'WidgetsBinding' runtime warnings using 3.0.0 stable release #103561

pattobrien · 2022-05-12T02:03:04Z

Pre-Requisites

Flutter installed with the latest 3.0.0 stable, using FVM version manager.

Steps to Reproduce

Execute flutter create test_app to create a new app
Execute flutter run to build and run app

Expected results:

No warnings in debug console.

Actual results:

The following warnings are seen:

 Warning: Operand of null-aware operation '!' has type 'SchedulerBinding' which excludes null.
../…/src/framework.dart:275
- 'SchedulerBinding' is from 'package:flutter/src/scheduler/binding.dart' ('../../../fvm/versions/stable/packages/flutter/lib/src/scheduler/binding.dart').
package:flutter/…/scheduler/binding.dart:1
    if (SchedulerBinding.instance!.schedulerPhase ==
                         ^
: Warning: Operand of null-aware operation '!' has type 'WidgetsBinding' which excludes null.
../…/src/widgets_binding_observer.dart:42
- 'WidgetsBinding' is from 'package:flutter/src/widgets/binding.dart' ('../../../fvm/versions/stable/packages/flutter/lib/src/widgets/binding.dart').
package:flutter/…/widgets/binding.dart:1
    _state = WidgetsBinding.instance!.lifecycleState;
                            ^

: Warning: Operand of null-aware operation '!' has type 'WidgetsBinding' which excludes null.
../…/src/widgets_binding_observer.dart:43
- 'WidgetsBinding' is from 'package:flutter/src/widgets/binding.dart' ('../../../fvm/versions/stable/packages/flutter/lib/src/widgets/binding.dart').
package:flutter/…/widgets/binding.dart:1
    WidgetsBinding.instance!.addObserver(this);
                   ^
: Warning: Operand of null-aware operation '!' has type 'WidgetsBinding' which excludes null.
../…/src/widgets_binding_observer.dart:52

Code sample

import 'package:flutter/material.dart';

void main() {
  WidgetsFlutterBinding.ensureInitialized();

  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: const MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({Key? key, required this.title}) : super(key: key);

  final String title;

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;

  void _incrementCounter() {
    setState(() {
      _counter++;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            const Text(
              'You have pushed the button this many times:',
            ),
            Text(
              '$_counter',
              style: Theme.of(context).textTheme.headline4,
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: const Icon(Icons.add),
      ),
    );
  }
}

Logs

fvm flutter analyze
Analyzing custom_widgets_custom_themes...                       
No issues found! (ran in 0.9s)

[✓] Flutter (Channel stable, 3.0.0, on macOS 12.3.1 21E258 darwin-arm, locale en-US)
    • Flutter version 3.0.0 at /Users/pattobrien/fvm/versions/stable
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision ee4e09cce0 (2 days ago), 2022-05-09 16:45:18 -0700
    • Engine revision d1b9a6938a
    • Dart version 2.17.0
    • DevTools version 2.12.2

[✓] Android toolchain - develop for Android devices (Android SDK version 33.0.0-rc1)
    • Android SDK at /Users/pattobrien/Library/Android/sdk
    • Platform android-31, build-tools 33.0.0-rc1
    • Java binary at: /Applications/Android Studio.app/Contents/jre/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 11.0.11+0-b60-7772763)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 13.3.1)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • CocoaPods version 1.11.3

[✓] Android Studio (version 2021.1)
    • Android Studio at /Applications/Android Studio.app/Contents
    • Flutter plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/6351-dart
    • Java version OpenJDK Runtime Environment (build 11.0.11+0-b60-7772763)

[✓] VS Code (version 1.67.1)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.40.0

[✓] Connected device (2 available)
    • iPhone 12 Pro (mobile) • 0296EE26-719D-4F1A-B59D-50FCB6EC3F7E • ios          • com.apple.CoreSimulator.SimRuntime.iOS-15-4
      (simulator)
    • macOS (desktop)        • macos                                • darwin-arm64 • macOS 12.3.1 21E258 darwin-arm

[✓] HTTP Host Availability
    • All required HTTP hosts are available

• No issues found!

The text was updated successfully, but these errors were encountered:

hiranlakshika · 2022-05-12T02:21:15Z

@pattobrien Did you find any temp fix for this?

meitesi · 2022-05-12T02:25:47Z

The same problem was found

ingmferrer · 2022-05-12T02:30:50Z

same warnings for me

pattobrien · 2022-05-12T04:05:06Z

@pattobrien Did you find any temp fix for this?

nope, no workaround found yet.

maxlapides · 2022-05-12T04:17:31Z

You can just ignore these warnings for now :)

darshankawar · 2022-05-12T08:25:53Z

Can somebody try to run dart fix --apply and see if the warnings go away ?
Also, they seem to be warnings and may not be hampering the build flow. Probably this PR might be related #89451

dkbast · 2022-05-12T08:34:13Z

fixed them all in my code, but I get messages from dependencies which is quite annoying

GitHelge · 2022-05-12T09:35:26Z

Ran dart fix --apply but it had nothing to fix because the problems are in community or other packages.

Can we somehow suppress the warnings in third party dependencies? - It makes logs unreadable on flutter test

darshankawar · 2022-05-12T09:37:43Z

These warnings could also be the result of the fact that Flutter 3 introduces nullability changes to WidgetsBinding.

ChrisElliotUK · 2022-05-12T09:39:20Z

Can somebody try to run dart fix --apply and see if the warnings go away ? Also, they seem to be warnings and may not be hampering the build flow. Probably this PR might be related #89451

This fixed my issue from here: #103571 (comment)

AnAlpaca · 2022-05-12T09:56:34Z

This issue has NOT gone away for me after running dart fix --apply unfortunately. Below is the only thing that shows in my terminal as an error and not a warning.

`Error: The non-abstract class 'GaMaterialLocalizations' is missing implementations for these members:

MaterialLocalizations.keyboardKeyAlt
MaterialLocalizations.keyboardKeyAltGraph
MaterialLocalizations.keyboardKeyBackspace
MaterialLocalizations.keyboardKeyCapsLock
MaterialLocalizations.keyboardKeyChannelDown
MaterialLocalizations.keyboardKeyChannelUp
MaterialLocalizations.keyboardKeyControl
MaterialLocalizations.keyboardKeyDelete
MaterialLocalizations.keyboardKeyEisu
MaterialLocalizations.keyboardKeyEject
MaterialLocalizations.keyboardKeyEnd
MaterialLocalizations.keyboardKeyEscape
MaterialLocalizations.keyboardKeyFn
MaterialLocalizations.keyboardKeyHangulMode
MaterialLocalizations.keyboardKeyHanjaMode
MaterialLocalizations.keyboardKeyHankaku
MaterialLocalizations.keyboardKeyHiragana
MaterialLocalizations.keyboardKeyHiraganaKatakana
MaterialLocalizations.keyboardKeyHome
MaterialLocalizations.keyboardKeyInsert
MaterialLocalizations.keyboardKeyKanaMode
MaterialLocalizations.keyboardKeyKanjiMode
MaterialLocalizations.keyboardKeyKatakana
MaterialLocalizations.keyboardKeyMeta
MaterialLocalizations.keyboardKeyMetaMacOs
MaterialLocalizations.keyboardKeyMetaWindows
MaterialLocalizations.keyboardKeyNumLock
MaterialLocalizations.keyboardKeyNumpad0
MaterialLocalizations.keyboardKeyNumpad1
MaterialLocalizations.keyboardKeyNumpad2
MaterialLocalizations.keyboardKeyNumpad3
MaterialLocalizations.keyboardKeyNumpad4
MaterialLocalizations.keyboardKeyNumpad5
MaterialLocalizations.keyboardKeyNumpad6
MaterialLocalizations.keyboardKeyNumpad7
MaterialLocalizations.keyboardKeyNumpad8
MaterialLocalizations.keyboardKeyNumpad9
MaterialLocalizations.keyboardKeyNumpadAdd
MaterialLocalizations.keyboardKeyNumpadComma
MaterialLocalizations.keyboardKeyNumpadDecimal
MaterialLocalizations.keyboardKeyNumpadDivide
MaterialLocalizations.keyboardKeyNumpadEnter
MaterialLocalizations.keyboardKeyNumpadEqual
MaterialLocalizations.keyboardKeyNumpadMultiply
MaterialLocalizations.keyboardKeyNumpadParenLeft
MaterialLocalizations.keyboardKeyNumpadParenRight
MaterialLocalizations.keyboardKeyNumpadSubtract
MaterialLocalizations.keyboardKeyPageDown
MaterialLocalizations.keyboardKeyPageUp
MaterialLocalizations.keyboardKeyPower
MaterialLocalizations.keyboardKeyPowerOff
MaterialLocalizations.keyboardKeyPrintScreen
MaterialLocalizations.keyboardKeyRomaji
MaterialLocalizations.keyboardKeyScrollLock
MaterialLocalizations.keyboardKeySelect
MaterialLocalizations.keyboardKeySpace
MaterialLocalizations.keyboardKeyZenkaku
MaterialLocalizations.keyboardKeyZenkakuHankaku
Try to either
provide an implementation,
inherit an implementation from a superclass or mixin,
mark the class as abstract, or
provide a 'noSuchMethod' implementation.`

pranavo72bex · 2022-05-12T10:58:30Z

Facing same issue

dart fix --apply It wouldn't work for me.

blue492 · 2022-05-12T11:08:58Z

This command NOT helped me dart fix --apply Android studion still show same warnings, and cant run the flutter app on it

EvanJin · 2022-05-12T11:34:01Z

dart fix --apply It wouldn't work for me.

darshankawar · 2022-05-12T12:33:30Z

Circling back on this issue, the warnings seems to be coming from framework itself and as mentioned earlier, could be related to #89451

If the warnings are coming from community plugins / packages, the fix need to be made in respective packages.

Based on the report and the traction received for this issue, I am going ahead and labeling it for further insights from the team.

/cc @Hixie

dev-thinks · 2022-05-12T12:34:20Z

same for me as well. console is being clogged by these warnings.

mtrfnvwork · 2022-05-12T12:37:13Z

+1

blue492 · 2022-05-12T12:42:48Z

A temporary solution is downgrading: flutter downgrade v2.10.5

hhajime · 2022-05-14T12:31:29Z

dart fix --apply doesn't work.
Anyone fixed this issue, please answer here.

https://stackoverflow.com/questions/72210211/warning-operand-of-null-aware-operation-has-type-widgetsbinding-which-exc

thanks.

hhajime · 2022-05-14T12:47:06Z

if you are using device preview package.
check this. aloisdeniel/flutter_device_preview#183
I solved it by deleted packages which makes problem.

AxanIqbal · 2022-05-14T12:53:30Z

the flutter pub upgrade did fix my crash that prevent me from build. i guess some packages really needs to upgrade/check if its compatible with v3

ahmeedev · 2022-05-14T19:14:48Z

dependencies needs to be upgraded!!, wait for the authors to update the dependencies.

maheshj01 · 2022-05-16T05:49:05Z

Those warnings are coming from third-party plugins compiled against the older version of flutter, Updating the plugin code with dart fix --apply as mentioned in the release notes should help fix this issue. To reiterate this is just a warning this shouldn't break the build process.

originally filed here #101497 (closed)

kaanaytemir · 2022-05-16T08:50:44Z

Upgrading my Kotlin version (manually), did the trick.

You can do that in your build.gradle.

buildscript {
    ext.kotlin_version = '1.6.21'
    repositories {
        google()
        jcenter()
    }

ahmadrafidev · 2022-05-16T12:52:20Z

Upgrading my Kotlin version (manually), did the trick.

You can do that in your build.gradle.
buildscript {
    ext.kotlin_version = '1.6.21'
    repositories {
        google()
        jcenter()
    }

doing the same thing, not work for me.

pranavo72bex · 2022-05-17T03:32:42Z

Any update ?

BerndWessels · 2022-05-17T05:00:55Z

Same here, upgraded to Flutter 3 and created a brand new app and getting:

Performing hot reload...
Syncing files to device Android SDK built for x86...
../../AppData/Local/Pub/Cache/hosted/pub.dartlang.org/flutter_web_auth-0.4.1/lib/flutter_web_auth.dart:33:20: Warning: Operand of null-aware operation '?.' has type 'WidgetsBinding' which excludes null.
 - 'WidgetsBinding' is from 'package:flutter/src/widgets/binding.dart' ('../../flutter/packages/flutter/lib/src/widgets/binding.dart').
    WidgetsBinding.instance?.removeObserver(_resumedObserver); // safety measure so we never add this observer twice
                   ^
../../AppData/Local/Pub/Cache/hosted/pub.dartlang.org/flutter_web_auth-0.4.1/lib/flutter_web_auth.dart:34:20: Warning: Operand of null-aware operation '?.' has type 'WidgetsBinding' which excludes null.
 - 'WidgetsBinding' is from 'package:flutter/src/widgets/binding.dart' ('../../flutter/packages/flutter/lib/src/widgets/binding.dart').
    WidgetsBinding.instance?.addObserver(_resumedObserver);
                   ^
../../AppData/Local/Pub/Cache/hosted/pub.dartlang.org/flutter_web_auth-0.4.1/lib/flutter_web_auth.dart:47:20: Warning: Operand of null-aware operation '?.' has type 'WidgetsBinding' which excludes null.
 - 'WidgetsBinding' is from 'package:flutter/src/widgets/binding.dart' ('../../flutter/packages/flutter/lib/src/widgets/binding.dart').
    WidgetsBinding.instance?.removeObserver(_resumedObserver);
                   ^
Reloaded 0 libraries in 193ms.

hassanannajjar · 2022-05-17T07:41:21Z

The same issue 💻
Any update?

skuzakov-voc · 2022-05-17T09:10:02Z

The same issue here. As far as I understand now, you can either ignore the warnings from third-party dependencies, or roll back to the previous version and wait until the dependency versions are updated to compatible with flutter 3.0.

JacoFourie · 2022-05-17T11:05:03Z

The app will not build. It is stated that they are only warnings but in my case the app will not build. So I can not ignore the warnings.

/E:/Flutter/.pub-cache/hosted/pub.dartlang.org/syncfusion_flutter_core-20.1.55/lib/src/legend/legend.dart:548:30: Warning: Operand of null-aware operation '!' has type 'SchedulerBinding' which excludes null.

'SchedulerBinding' is from 'package:flutter/src/scheduler/binding.dart' ('/E:/Flutter/packages/flutter/lib/src/scheduler/binding.dart').
SchedulerBinding.instance!.addPostFrameCallback(
^

FAILURE: Build failed with an exception.

Where:
Script 'E:\Flutter\packages\flutter_tools\gradle\flutter.gradle' line: 1156
What went wrong:
Execution failed for task ':app:compileFlutterBuildDebug'.

Process 'command 'E:\Flutter\bin\flutter.bat'' finished with non-zero exit value 1

Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.
Get more help at https://help.gradle.org

BUILD FAILED in 38s
Exception: Gradle task assembleDebug failed with exit code 1

RudyLie1988 · 2022-05-17T13:45:01Z

Pre-Requisites

Flutter installed with the latest 3.0.0 stable, using FVM version manager.

Steps to Reproduce

Execute flutter create test_app to create a new app
Execute flutter run to build and run app

Expected results:

No warnings in debug console.

Actual results:

The following warnings are seen:

 Warning: Operand of null-aware operation '!' has type 'SchedulerBinding' which excludes null.
../…/src/framework.dart:275
- 'SchedulerBinding' is from 'package:flutter/src/scheduler/binding.dart' ('../../../fvm/versions/stable/packages/flutter/lib/src/scheduler/binding.dart').
package:flutter/…/scheduler/binding.dart:1
    if (SchedulerBinding.instance!.schedulerPhase ==
                         ^
: Warning: Operand of null-aware operation '!' has type 'WidgetsBinding' which excludes null.
../…/src/widgets_binding_observer.dart:42
- 'WidgetsBinding' is from 'package:flutter/src/widgets/binding.dart' ('../../../fvm/versions/stable/packages/flutter/lib/src/widgets/binding.dart').
package:flutter/…/widgets/binding.dart:1
    _state = WidgetsBinding.instance!.lifecycleState;
                            ^

: Warning: Operand of null-aware operation '!' has type 'WidgetsBinding' which excludes null.
../…/src/widgets_binding_observer.dart:43
- 'WidgetsBinding' is from 'package:flutter/src/widgets/binding.dart' ('../../../fvm/versions/stable/packages/flutter/lib/src/widgets/binding.dart').
package:flutter/…/widgets/binding.dart:1
    WidgetsBinding.instance!.addObserver(this);
                   ^
: Warning: Operand of null-aware operation '!' has type 'WidgetsBinding' which excludes null.
../…/src/widgets_binding_observer.dart:52

Code sample
Logs

I think i should share with you guys.
I update Flutter to latest version using Android Studio

When I run project, error shown below

Then I go to grouped_list.dart, and find function addPostFrameCallback.
I remove exclamation mark before function call.

If your editor prompt this, just proceed

Note:
I also change my build.gradle
from: ext.kotlin_version = '1.3.50'
to: ext.kotlin_version = '1.5.10'

Now my apps run without error.

JacoFourie · 2022-05-17T14:34:11Z

@RudyLie1988 the issue is not my own code but all the libraries and packages that I do not have control over also has them in. Yes I can remove it from my own code but your fix will not fix all the libs I am using. I did a Dart --fix and it removed all the ! from my own code but not the libs. And people say it should not stop the build. Yet it does break the build.

Chaos-woo · 2022-05-17T15:57:20Z

You can just ignore these warnings for now :)

i want to know how to ignore it? plz.

jnthnklvn · 2022-05-17T18:21:23Z

You can just ignore these warnings for now :)

i want to know how to ignore it? plz.

Just don't look at it

JacoFourie · 2022-05-17T18:24:33Z

@jnthnklvn are you trying to be funny? I can not ignore it as the build fails as I showed above. So not looking at it won't help.

jnthnklvn · 2022-05-17T18:29:00Z

@jnthnklvn are you trying to be funny? I can not ignore it as the build fails as I showed above. So not looking at it won't help.

No, I'm not. I was answering just about his mention. In your case could be this:

#103561 (comment)

JacoFourie · 2022-05-17T19:26:32Z

All works 100% and compiles using 2.10.5. After I upgrade to version 3 I get all these errors and the build will fail.
I updated the kotlin version to 1.6.21 also. Still no luck.
So how do I see what is causing the issue as this is the output.

Launching lib\main.dart on SM A013G in debug mode...
Running Gradle task 'assembleDebug'...
lib/screens/flow_screen.dart:176:20: Warning: Operand of null-aware operation '?.' has type 'WidgetsBinding' which excludes null.
 - 'WidgetsBinding' is from 'package:flutter/src/widgets/binding.dart' ('/E:/Flutter/packages/flutter/lib/src/widgets/binding.dart').
    WidgetsBinding.instance?.addObserver(this);
                   ^
lib/screens/flow_screen.dart:342:20: Warning: Operand of null-aware operation '?.' has type 'WidgetsBinding' which excludes null.
 - 'WidgetsBinding' is from 'package:flutter/src/widgets/binding.dart' ('/E:/Flutter/packages/flutter/lib/src/widgets/binding.dart').
    WidgetsBinding.instance?.removeObserver(this);
                   ^
lib/screens/flow_screen.dart:695:24: Warning: Operand of null-aware operation '?.' has type 'WidgetsBinding' which excludes null.
 - 'WidgetsBinding' is from 'package:flutter/src/widgets/binding.dart' ('/E:/Flutter/packages/flutter/lib/src/widgets/binding.dart').
        WidgetsBinding.instance?.addPostFrameCallback((_) {
                       ^
lib/screens/flow_screen.dart:735:22: Warning: Operand of null-aware operation '?.' has type 'WidgetsBinding' which excludes null.
 - 'WidgetsBinding' is from 'package:flutter/src/widgets/binding.dart' ('/E:/Flutter/packages/flutter/lib/src/widgets/binding.dart').
      WidgetsBinding.instance?.addPostFrameCallback((_) {
                     ^
lib/screens/flow_screen.dart:1877:20: Warning: Operand of null-aware operation '?.' has type 'WidgetsBinding' which excludes null.
 - 'WidgetsBinding' is from 'package:flutter/src/widgets/binding.dart' ('/E:/Flutter/packages/flutter/lib/src/widgets/binding.dart').
    WidgetsBinding.instance?.addPostFrameCallback((_) {
                   ^
lib/screens/pv_screen.dart:85:20: Warning: Operand of null-aware operation '!' has type 'WidgetsBinding' which excludes null.
 - 'WidgetsBinding' is from 'package:flutter/src/widgets/binding.dart' ('/E:/Flutter/packages/flutter/lib/src/widgets/binding.dart').
    WidgetsBinding.instance!.addPostFrameCallback((_) {
                   ^
lib/screens/pv_history_chart_screen.dart:38:20: Warning: Operand of null-aware operation '!' has type 'WidgetsBinding' which excludes null.
 - 'WidgetsBinding' is from 'package:flutter/src/widgets/binding.dart' ('/E:/Flutter/packages/flutter/lib/src/widgets/binding.dart').
    WidgetsBinding.instance!.addObserver(this);
                   ^
lib/screens/pv_history_chart_screen.dart:50:20: Warning: Operand of null-aware operation '!' has type 'WidgetsBinding' which excludes null.
 - 'WidgetsBinding' is from 'package:flutter/src/widgets/binding.dart' ('/E:/Flutter/packages/flutter/lib/src/widgets/binding.dart').
    WidgetsBinding.instance!.addPostFrameCallback((_) {
                   ^
lib/screens/grid_screen.dart:61:20: Warning: Operand of null-aware operation '!' has type 'WidgetsBinding' which excludes null.
 - 'WidgetsBinding' is from 'package:flutter/src/widgets/binding.dart' ('/E:/Flutter/packages/flutter/lib/src/widgets/binding.dart').
    WidgetsBinding.instance!.addPostFrameCallback((_) {
                   ^
lib/screens/load_screen.dart:62:20: Warning: Operand of null-aware operation '!' has type 'WidgetsBinding' which excludes null.
 - 'WidgetsBinding' is from 'package:flutter/src/widgets/binding.dart' ('/E:/Flutter/packages/flutter/lib/src/widgets/binding.dart').
    WidgetsBinding.instance!.addPostFrameCallback((_) {
                   ^
lib/screens/load_history_chart_screen.dart:44:20: Warning: Operand of null-aware operation '!' has type 'WidgetsBinding' which excludes null.
 - 'WidgetsBinding' is from 'package:flutter/src/widgets/binding.dart' ('/E:/Flutter/packages/flutter/lib/src/widgets/binding.dart').
    WidgetsBinding.instance!.addObserver(this);
                   ^
lib/screens/load_history_chart_screen.dart:58:20: Warning: Operand of null-aware operation '!' has type 'WidgetsBinding' which excludes null.
 - 'WidgetsBinding' is from 'package:flutter/src/widgets/binding.dart' ('/E:/Flutter/packages/flutter/lib/src/widgets/binding.dart').
    WidgetsBinding.instance!.addPostFrameCallback((_) {
                   ^
lib/screens/battery_screen.dart:54:20: Warning: Operand of null-aware operation '!' has type 'WidgetsBinding' which excludes null.
 - 'WidgetsBinding' is from 'package:flutter/src/widgets/binding.dart' ('/E:/Flutter/packages/flutter/lib/src/widgets/binding.dart').
    WidgetsBinding.instance!.addPostFrameCallback((_) {
                   ^
lib/screens/systems_screen.dart:32:20: Warning: Operand of null-aware operation '!' has type 'WidgetsBinding' which excludes null.
 - 'WidgetsBinding' is from 'package:flutter/src/widgets/binding.dart' ('/E:/Flutter/packages/flutter/lib/src/widgets/binding.dart').
    WidgetsBinding.instance!.addPostFrameCallback((_) {
                   ^
lib/screens/profile_screen.dart:32:20: Warning: Operand of null-aware operation '!' has type 'WidgetsBinding' which excludes null.
 - 'WidgetsBinding' is from 'package:flutter/src/widgets/binding.dart' ('/E:/Flutter/packages/flutter/lib/src/widgets/binding.dart').
    WidgetsBinding.instance!.addPostFrameCallback((_) {
                   ^
lib/screens/battery_history_chart_screen.dart:44:20: Warning: Operand of null-aware operation '!' has type 'WidgetsBinding' which excludes null.
 - 'WidgetsBinding' is from 'package:flutter/src/widgets/binding.dart' ('/E:/Flutter/packages/flutter/lib/src/widgets/binding.dart').
    WidgetsBinding.instance!.addObserver(this);
                   ^
lib/screens/battery_history_chart_screen.dart:58:20: Warning: Operand of null-aware operation '!' has type 'WidgetsBinding' which excludes null.
 - 'WidgetsBinding' is from 'package:flutter/src/widgets/binding.dart' ('/E:/Flutter/packages/flutter/lib/src/widgets/binding.dart').
    WidgetsBinding.instance!.addPostFrameCallback((_) {
                   ^
lib/screens/overview_chart_screen.dart:45:20: Warning: Operand of null-aware operation '!' has type 'WidgetsBinding' which excludes null.
 - 'WidgetsBinding' is from 'package:flutter/src/widgets/binding.dart' ('/E:/Flutter/packages/flutter/lib/src/widgets/binding.dart').
    WidgetsBinding.instance!.addObserver(this);
                   ^
lib/screens/overview_chart_screen.dart:60:20: Warning: Operand of null-aware operation '!' has type 'WidgetsBinding' which excludes null.
 - 'WidgetsBinding' is from 'package:flutter/src/widgets/binding.dart' ('/E:/Flutter/packages/flutter/lib/src/widgets/binding.dart').
    WidgetsBinding.instance!.addPostFrameCallback((_) {
                   ^
lib/screens/overview_history_chart_screen.dart:48:20: Warning: Operand of null-aware operation '!' has type 'WidgetsBinding' which excludes null.
 - 'WidgetsBinding' is from 'package:flutter/src/widgets/binding.dart' ('/E:/Flutter/packages/flutter/lib/src/widgets/binding.dart').
    WidgetsBinding.instance!.addObserver(this);
                   ^
lib/screens/overview_history_chart_screen.dart:63:20: Warning: Operand of null-aware operation '!' has type 'WidgetsBinding' which excludes null.
 - 'WidgetsBinding' is from 'package:flutter/src/widgets/binding.dart' ('/E:/Flutter/packages/flutter/lib/src/widgets/binding.dart').
    WidgetsBinding.instance!.addPostFrameCallback((_) {
                   ^
lib/screens/grid_history_chart_screen.dart:44:20: Warning: Operand of null-aware operation '!' has type 'WidgetsBinding' which excludes null.
 - 'WidgetsBinding' is from 'package:flutter/src/widgets/binding.dart' ('/E:/Flutter/packages/flutter/lib/src/widgets/binding.dart').
    WidgetsBinding.instance!.addObserver(this);
                   ^
lib/screens/grid_history_chart_screen.dart:58:20: Warning: Operand of null-aware operation '!' has type 'WidgetsBinding' which excludes null.
 - 'WidgetsBinding' is from 'package:flutter/src/widgets/binding.dart' ('/E:/Flutter/packages/flutter/lib/src/widgets/binding.dart').
    WidgetsBinding.instance!.addPostFrameCallback((_) {
                   ^
lib/screens/log_screen.dart:33:20: Warning: Operand of null-aware operation '!' has type 'WidgetsBinding' which excludes null.
 - 'WidgetsBinding' is from 'package:flutter/src/widgets/binding.dart' ('/E:/Flutter/packages/flutter/lib/src/widgets/binding.dart').
    WidgetsBinding.instance!.addPostFrameCallback((_) {
                   ^
lib/screens/switch_screen.dart:28:20: Warning: Operand of null-aware operation '!' has type 'WidgetsBinding' which excludes null.
 - 'WidgetsBinding' is from 'package:flutter/src/widgets/binding.dart' ('/E:/Flutter/packages/flutter/lib/src/widgets/binding.dart').
    WidgetsBinding.instance!.addPostFrameCallback((_) {
                   ^
/E:/Flutter/.pub-cache/hosted/pub.dartlang.org/rive-0.8.4/lib/src/controllers/one_shot_controller.dart:40:26: Warning: Operand of null-aware operation '?.' has type 'WidgetsBinding' which excludes null.
 - 'WidgetsBinding' is from 'package:flutter/src/widgets/binding.dart' ('/E:/Flutter/packages/flutter/lib/src/widgets/binding.dart').
        : WidgetsBinding.instance?.addPostFrameCallback((_) => onStop?.call());
                         ^
/E:/Flutter/.pub-cache/hosted/pub.dartlang.org/syncfusion_flutter_charts-20.1.55/lib/src/chart/base/chart_base.dart:1820:26: Warning: Operand of null-aware operation '!' has type 'SchedulerBinding' which excludes null.
 - 'SchedulerBinding' is from 'package:flutter/src/scheduler/binding.dart' ('/E:/Flutter/packages/flutter/lib/src/scheduler/binding.dart').
        SchedulerBinding.instance!.addPostFrameCallback((_) {
                         ^
/E:/Flutter/.pub-cache/hosted/pub.dartlang.org/syncfusion_flutter_charts-20.1.55/lib/src/chart/base/chart_base.dart:1829:28: Warning: Operand of null-aware operation '?.' has type 'SchedulerBinding' which excludes null.
 - 'SchedulerBinding' is from 'package:flutter/src/scheduler/binding.dart' ('/E:/Flutter/packages/flutter/lib/src/scheduler/binding.dart').
          SchedulerBinding.instance?.addPostFrameCallback((_) => _refresh());
                           ^
/E:/Flutter/.pub-cache/hosted/pub.dartlang.org/syncfusion_flutter_charts-20.1.55/lib/src/circular_chart/base/circular_base.dart:948:26: Warning: Operand of null-aware operation '!' has type 'SchedulerBinding' which excludes null.
 - 'SchedulerBinding' is from 'package:flutter/src/scheduler/binding.dart' ('/E:/Flutter/packages/flutter/lib/src/scheduler/binding.dart').
        SchedulerBinding.instance!.addPostFrameCallback((_) {
                         ^
/E:/Flutter/.pub-cache/hosted/pub.dartlang.org/syncfusion_flutter_charts-20.1.55/lib/src/circular_chart/base/circular_base.dart:962:28: Warning: Operand of null-aware operation '!' has type 'SchedulerBinding' which excludes null.
 - 'SchedulerBinding' is from 'package:flutter/src/scheduler/binding.dart' ('/E:/Flutter/packages/flutter/lib/src/scheduler/binding.dart').
          SchedulerBinding.instance!.addPostFrameCallback((_) => _refresh());
                           ^
/E:/Flutter/.pub-cache/hosted/pub.dartlang.org/syncfusion_flutter_charts-20.1.55/lib/src/funnel_chart/base/funnel_base.dart:720:26: Warning: Operand of null-aware operation '!' has type 'SchedulerBinding' which excludes null.
 - 'SchedulerBinding' is from 'package:flutter/src/scheduler/binding.dart' ('/E:/Flutter/packages/flutter/lib/src/scheduler/binding.dart').
        SchedulerBinding.instance!.addPostFrameCallback((_) {
                         ^
/E:/Flutter/.pub-cache/hosted/pub.dartlang.org/syncfusion_flutter_charts-20.1.55/lib/src/funnel_chart/base/funnel_base.dart:732:28: Warning: Operand of null-aware operation '!' has type 'SchedulerBinding' which excludes null.
 - 'SchedulerBinding' is from 'package:flutter/src/scheduler/binding.dart' ('/E:/Flutter/packages/flutter/lib/src/scheduler/binding.dart').
          SchedulerBinding.instance!.addPostFrameCallback((_) => _refresh());
                           ^
/E:/Flutter/.pub-cache/hosted/pub.dartlang.org/syncfusion_flutter_charts-20.1.55/lib/src/pyramid_chart/base/pyramid_base.dart:714:26: Warning: Operand of null-aware operation '!' has type 'SchedulerBinding' which excludes null.
 - 'SchedulerBinding' is from 'package:flutter/src/scheduler/binding.dart' ('/E:/Flutter/packages/flutter/lib/src/scheduler/binding.dart').
        SchedulerBinding.instance!.addPostFrameCallback((_) {
                         ^
/E:/Flutter/.pub-cache/hosted/pub.dartlang.org/syncfusion_flutter_charts-20.1.55/lib/src/pyramid_chart/base/pyramid_base.dart:725:28: Warning: Operand of null-aware operation '!' has type 'SchedulerBinding' which excludes null.
 - 'SchedulerBinding' is from 'package:flutter/src/scheduler/binding.dart' ('/E:/Flutter/packages/flutter/lib/src/scheduler/binding.dart').
          SchedulerBinding.instance!.addPostFrameCallback((_) => _refresh());
                           ^
/E:/Flutter/.pub-cache/hosted/pub.dartlang.org/syncfusion_flutter_datepicker-20.1.55/lib/src/date_picker/date_picker.dart:8063:22: Warning: Operand of null-aware operation '?.' has type 'SchedulerBinding' which excludes null.
 - 'SchedulerBinding' is from 'package:flutter/src/scheduler/binding.dart' ('/E:/Flutter/packages/flutter/lib/src/scheduler/binding.dart').
    SchedulerBinding.instance?.addPostFrameCallback((_) {
                     ^
/E:/Flutter/.pub-cache/hosted/pub.dartlang.org/syncfusion_flutter_datepicker-20.1.55/lib/src/date_picker/date_picker.dart:9832:22: Warning: Operand of null-aware operation '!' has type 'SchedulerBinding' which excludes null.
 - 'SchedulerBinding' is from 'package:flutter/src/scheduler/binding.dart' ('/E:/Flutter/packages/flutter/lib/src/scheduler/binding.dart').
    SchedulerBinding.instance!.addPostFrameCallback((_) {
                     ^
/E:/Flutter/.pub-cache/hosted/pub.dartlang.org/rive-0.8.4/lib/src/rive_core/state_machine_controller.dart:220:24: Warning: Operand of null-aware operation '?.' has type 'SchedulerBinding' which excludes null.
 - 'SchedulerBinding' is from 'package:flutter/src/scheduler/binding.dart' ('/E:/Flutter/packages/flutter/lib/src/scheduler/binding.dart').
      SchedulerBinding.instance?.addPostFrameCallback((_) {
                       ^
/E:/Flutter/.pub-cache/hosted/pub.dartlang.org/rive-0.8.4/lib/src/rive_render_box.dart:190:26: Warning: Operand of null-aware operation '?.' has type 'SchedulerBinding' which excludes null.
 - 'SchedulerBinding' is from 'package:flutter/src/scheduler/binding.dart' ('/E:/Flutter/packages/flutter/lib/src/scheduler/binding.dart').
        SchedulerBinding.instance?.scheduleFrameCallback(_frameCallback) ?? -1;
                         ^
/E:/Flutter/.pub-cache/hosted/pub.dartlang.org/back_button_interceptor-5.0.2/lib/src/back_button_interceptor.dart:29:74: Warning: Operand of null-aware operation '!' has type 'WidgetsBinding' which excludes null.
 - 'WidgetsBinding' is from 'package:flutter/src/widgets/binding.dart' ('/E:/Flutter/packages/flutter/lib/src/widgets/binding.dart').
  static Future<void> Function() handlePopRouteFunction = WidgetsBinding.instance!.handlePopRoute;
                                                                         ^
/E:/Flutter/.pub-cache/hosted/pub.dartlang.org/back_button_interceptor-5.0.2/lib/src/back_button_interceptor.dart:32:22: Warning: Operand of null-aware operation '!' has type 'WidgetsBinding' which excludes null.
 - 'WidgetsBinding' is from 'package:flutter/src/widgets/binding.dart' ('/E:/Flutter/packages/flutter/lib/src/widgets/binding.dart').
      WidgetsBinding.instance!.handlePushRoute as Future<void> Function(String?);
                     ^
/E:/Flutter/.pub-cache/hosted/pub.dartlang.org/syncfusion_flutter_gauges-20.1.55/lib/src/linear_gauge/gauge/linear_gauge_scope.dart:40:10: Error: A value of type 'Widget' can't be assigned to a variable of type 'InheritedWidget'.
 - 'Widget' is from 'package:flutter/src/widgets/framework.dart' ('/E:/Flutter/packages/flutter/lib/src/widgets/framework.dart').
 - 'InheritedWidget' is from 'package:flutter/src/widgets/framework.dart' ('/E:/Flutter/packages/flutter/lib/src/widgets/framework.dart').
        .widget;
         ^
/E:/Flutter/.pub-cache/hosted/pub.dartlang.org/syncfusion_flutter_gauges-20.1.55/lib/src/radial_gauge/pointers/marker_pointer_renderer.dart:607:22: Warning: Operand of null-aware operation '!' has type 'WidgetsBinding' which excludes null.
 - 'WidgetsBinding' is from 'package:flutter/src/widgets/binding.dart' ('/E:/Flutter/packages/flutter/lib/src/widgets/binding.dart').
      WidgetsBinding.instance!
                     ^
/E:/Flutter/.pub-cache/hosted/pub.dartlang.org/syncfusion_flutter_core-20.1.55/lib/src/legend/legend.dart:548:30: Warning: Operand of null-aware operation '!' has type 'SchedulerBinding' which excludes null.
 - 'SchedulerBinding' is from 'package:flutter/src/scheduler/binding.dart' ('/E:/Flutter/packages/flutter/lib/src/scheduler/binding.dart').
            SchedulerBinding.instance!.addPostFrameCallback(
                             ^


FAILURE: Build failed with an exception.

* Where:
Script 'E:\Flutter\packages\flutter_tools\gradle\flutter.gradle' line: 1156

* What went wrong:
Execution failed for task ':app:compileFlutterBuildDebug'.
> Process 'command 'E:\Flutter\bin\flutter.bat'' finished with non-zero exit value 1

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

BUILD FAILED in 1m 9s
Exception: Gradle task assembleDebug failed with exit code 1

jnthnklvn · 2022-05-17T20:57:53Z

@JacoFourie, the error appears to have something about this:

/E:/Flutter/.pub-cache/hosted/pub.dartlang.org/syncfusion_flutter_gauges-20.1.55/lib/src/linear_gauge/gauge/linear_gauge_scope.dart:40:10: Error: A value of type 'Widget' can't be assigned to a variable of type 'InheritedWidget'.

'Widget' is from 'package:flutter/src/widgets/framework.dart' ('/E:/Flutter/packages/flutter/lib/src/widgets/framework.dart').

'InheritedWidget' is from 'package:flutter/src/widgets/framework.dart' ('/E:/Flutter/packages/flutter/lib/src/widgets/framework.dart').
.widget;

May you can try to update that package and see if the build problem solves...

Hixie · 2022-05-17T21:54:00Z

If you are getting an error please file a separate bug.

Hixie · 2022-05-17T21:58:30Z

I'm going to close this issue since I think we understand it well now.

The underlying issue of showing warnings about dependencies is an issue we will resolve on the Dart side via dart-lang/sdk#46264.

If you are only getting warnings, meaning the app still runs, you may ignore them, they are harmless, and do not indicate a problem. As your dependencies update, the warnings will go away.

If you are getting errors, or if you appear to only be getting warnings but the app nonetheless does not build or execute, please file a new bug and we will try to determine the cause and resolve those issues. Make sure to include full logs from flutter run -v.

Thank you for your continued use of Flutter!

mark8044 mentioned this issue May 12, 2022

Warning: Operand of null-aware operation '?.' has type 'WidgetsBinding' which excludes null daohoangson/flutter_widget_from_html#769

Closed

darshankawar added the in triage Presently being triaged by the triage team label May 12, 2022

darshankawar added the waiting for customer response The Flutter team cannot make further progress on this issue until the original reporter responds label May 12, 2022

darshankawar mentioned this issue May 12, 2022

Can't build my app using flutter 3.0 #103571

Closed

zawadZwd mentioned this issue May 12, 2022

Flutter 3.0 changes Dev-hwang/flutter_foreground_task#78

Closed

raulmabe mentioned this issue May 12, 2022

iOS build & flutter test fails on Flutter 3.0 #103614

Closed

darshankawar added a: error message Error messages from the Flutter framework a: null-safety Support for the Dart's team new null safety feature labels May 12, 2022

Nayuta403 mentioned this issue May 15, 2022

Quickly fix for xxxBinding.instance! In Flutter 3.0. warning reporting problem #103853

Closed

This was referenced May 16, 2022

Upgrade Flutter 3.0 from 2.8.1: Warning: Operand of null-aware operation '?.' has type 'PaintingBinding' which excludes null error #103793

Closed

Flutter 3.0.0 bugs #103796

Closed

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maheshj01 mentioned this issue May 17, 2022

flutter 3.0.0 update issue maheshj01/searchfield#29

Closed

Hixie closed this as completed May 17, 2022

flutter locked as resolved and limited conversation to collaborators May 17, 2022

darshankawar added the r: solved Issue is closed as solved label May 18, 2022

'WidgetsBinding' runtime warnings using 3.0.0 stable release #103561

'WidgetsBinding' runtime warnings using 3.0.0 stable release #103561

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pattobrien commented May 12, 2022

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Pre-Requisites

Steps to Reproduce

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