firebase_core: Unhandled Exception: PlatformException(channel-error, Unable to establish connection on channel., null, null) on IOS emulator

[kanntim]

Is there an existing issue for this?

• I have searched the existing issues.

Which plugins are affected?

Core

Which platforms are affected?

iOS

Description

Even if I run await Firebase.initializeApp(); in the Flutter startup project, I still get an error:
Unhandled Exception: PlatformException(channel-error, Unable to establish connection on channel., null, null)

I have tried flutter clean, pod update and so on many times, but the error does not disappear.

Reproducing the issue

import` 'package:firebase_core/firebase_core.dart';
import 'package:flutter/material.dart';
import 'package:wordmemorizer/firebase_options.dart';

void main() async{
  WidgetsFlutterBinding.ensureInitialized();

  await Firebase.initializeApp(
    options: DefaultFirebaseOptions.currentPlatform,
  );
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      theme: ThemeData(
        colorScheme: ColorScheme.fromSeed(seedColor: Colors.purple),
        fontFamily: 'Roboto',
        useMaterial3: true,
      ),
      home: Scaffold(backgroundColor: Colors.red,),
    );
  }
}

Firebase Core version

2.31.0

Flutter Version

3.22.0

Relevant Log Output

[ERROR:flutter/runtime/dart_vm_initializer.cc(41)] Unhandled Exception: PlatformException(channel-error, Unable to establish connection on channel., null, null)
#0      FirebaseCoreHostApi.initializeCore (package:firebase_core_platform_interface/src/pigeon/messages.pigeon.dart:210:7)
<asynchronous suspension>
#1      MethodChannelFirebase._initializeCore (package:firebase_core_platform_interface/src/method_channel/method_channel_firebase.dart:29:44)
<asynchronous suspension>
#2      MethodChannelFirebase.initializeApp (package:firebase_core_platform_interface/src/method_channel/method_channel_firebase.dart:73:7)
<asynchronous suspension>
#3      Firebase.initializeApp (package:firebase_core/src/firebase.dart:43:31)
<asynchronous suspension>
#4      main (package:wordmemorizer/main.dart:9:3)
<asynchronous suspension>

Flutter dependencies

Expand Flutter dependencies snippet

dependencies:
- cupertino_icons 1.0.8
- firebase_core 2.31.0 [firebase_core_platform_interface firebase_core_web flutter meta]
- flutter 0.0.0 [characters collection material_color_utilities meta vector_math sky_engine]

dev dependencies:
- flutter_lints 3.0.2 [lints]
- flutter_test 0.0.0 [flutter test_api matcher path fake_async clock stack_trace vector_math leak_tracker_flutter_testing async boolean_selector characters collection leak_tracker leak_tracker_testing material_color_utilities meta source_span stream_channel string_scanner term_glyph vm_service]

transitive dependencies:
- async 2.11.0 [collection meta]
- boolean_selector 2.1.1 [source_span string_scanner]
- characters 1.3.0
- clock 1.1.1
- collection 1.18.0
- fake_async 1.3.1 [clock collection]
- firebase_core_platform_interface 5.0.0 [collection flutter flutter_test meta plugin_platform_interface]
- firebase_core_web 2.17.0 [firebase_core_platform_interface flutter flutter_web_plugins meta web]
- flutter_web_plugins 0.0.0 [flutter characters collection material_color_utilities meta vector_math]
- leak_tracker 10.0.4 [clock collection meta path vm_service]
- leak_tracker_flutter_testing 3.0.3 [flutter leak_tracker leak_tracker_testing matcher meta]
- leak_tracker_testing 3.0.1 [leak_tracker matcher meta]
- lints 3.0.0
- matcher 0.12.16+1 [async meta stack_trace term_glyph test_api]
- material_color_utilities 0.8.0 [collection]
- meta 1.12.0
- path 1.9.0
- plugin_platform_interface 2.1.8 [meta]
- sky_engine 0.0.99
- source_span 1.10.0 [collection path term_glyph]
- stack_trace 1.11.1 [path]
- stream_channel 2.1.2 [async]
- string_scanner 1.2.0 [source_span]
- term_glyph 1.2.1
- test_api 0.7.0 [async boolean_selector collection meta source_span stack_trace stream_channel string_scanner term_glyph]
- vector_math 2.1.4
- vm_service 14.2.1
- web 0.5.1

Additional context and comments

Doctor -V:

[✓] Flutter (Channel stable, 3.22.0, on macOS 14.5 23F79 darwin-arm64, locale en-ME)
• Flutter version 3.22.0 on channel stable at /Users/noor/dev/flutter
• Upstream repository https://github.com/flutter/flutter.git
• Framework revision 5dcb86f68f (11 days ago), 2024-05-09 07:39:20 -0500
• Engine revision f6344b75dc
• Dart version 3.4.0
• DevTools version 2.34.3

[✓] Android toolchain - develop for Android devices (Android SDK version 33.0.2)
• Android SDK at /Users/noor/Library/Android/sdk
• Platform android-33, build-tools 33.0.2
• Java binary at: /Applications/Android Studio.app/Contents/jbr/Contents/Home/bin/java
• Java version OpenJDK Runtime Environment (build 17.0.10+0-17.0.10b1087.21-11572160)
• All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 15.2)
• Xcode at /Applications/Xcode.app/Contents/Developer
• Build 15C500b
• CocoaPods version 1.14.3

[✓] Chrome - develop for the web
• Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio (version 2023.3)
• 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 17.0.10+0-17.0.10b1087.21-11572160)

[✓] VS Code (version 1.85.1)
• VS Code at /Applications/Visual Studio Code.app/Contents
• Flutter extension version 3.80.0

[✓] Connected device (5 available)
• iPhone 15 Pro (mobile) • 1D57D903-F080-40B4-BE0A-000895206D48 • ios • com.apple.CoreSimulator.SimRuntime.iOS-17-0 (simulator)
• iPhone 15 Pro Max (mobile) • 8D7E0804-5A96-45B1-B8AF-06EF61E5BC3F • ios • com.apple.CoreSimulator.SimRuntime.iOS-17-0 (simulator)
• macOS (desktop) • macos • darwin-arm64 • macOS 14.5 23F79 darwin-arm64
• Mac Designed for iPad (desktop) • mac-designed-for-ipad • darwin • macOS 14.5 23F79 darwin-arm64
• Chrome (web) • chrome • web-javascript • Google Chrome 125.0.6422.60

[✓] Network resources
• All expected network resources are available.

• No issues found!

[TarekkMA]

@kanntim Thank you for reporting this issue, can you please try to run any of the flutter example apps and see if you get this issue?

[kanntim]

@TarekkMA I ran the official example from pub.dev (note that there you need to click the "initialize default app" button in the application to start Firbase_core initialization). the problem still occurs in this application.
I also tried to configure the project from Firbase CLI, and the error remains the same.

// Copyright 2019 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

import 'dart:async';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:firebase_core/firebase_core.dart';
import 'firebase_options.dart';

void main() => runApp(const MyApp());

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

  String get name => 'foo';

  Future<void> initializeDefault() async {
    FirebaseApp app = await Firebase.initializeApp(
      options: DefaultFirebaseOptions.currentPlatform,
    );
    print('Initialized default app $app');
  }

  Future<void> initializeDefaultFromAndroidResource() async {
    if (defaultTargetPlatform != TargetPlatform.android || kIsWeb) {
      print('Not running on Android, skipping');
      return;
    }
    FirebaseApp app = await Firebase.initializeApp();
    print('Initialized default app $app from Android resource');
  }

  Future<void> initializeSecondary() async {
    FirebaseApp app = await Firebase.initializeApp(
      name: name,
      options: DefaultFirebaseOptions.currentPlatform,
    );

    print('Initialized $app');
  }

  void apps() {
    final List<FirebaseApp> apps = Firebase.apps;
    print('Currently initialized apps: $apps');
  }

  void options() {
    final FirebaseApp app = Firebase.app();
    final options = app.options;
    print('Current options for app ${app.name}: $options');
  }

  Future<void> delete() async {
    final FirebaseApp app = Firebase.app(name);
    await app.delete();
    print('App $name deleted');
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('Firebase Core example app'),
        ),
        body: Padding(
          padding: const EdgeInsets.all(20),
          child: Column(
            mainAxisAlignment: MainAxisAlignment.spaceAround,
            crossAxisAlignment: CrossAxisAlignment.stretch,
            children: <Widget>[
              ElevatedButton(
                onPressed: initializeDefault,
                child: const Text('Initialize default app'),
              ),
              if (defaultTargetPlatform == TargetPlatform.android && !kIsWeb)
                ElevatedButton(
                  onPressed: initializeDefaultFromAndroidResource,
                  child: const Text(
                    'Initialize default app from Android resources',
                  ),
                ),
              ElevatedButton(
                onPressed: initializeSecondary,
                child: const Text('Initialize secondary app'),
              ),
              ElevatedButton(
                onPressed: apps,
                child: const Text('List apps'),
              ),
              ElevatedButton(
                onPressed: options,
                child: const Text('List default options'),
              ),
              ElevatedButton(
                onPressed: delete,
                child: const Text('Delete secondary app'),
              ),
            ],
          ),
        ),
      ),
    );
  }
}

[kanntim]

I found the reason. If I delete the application signature in XCode in the Signin&Capabilities section (select None), then Firebase initializes normally. I forgot to add the team ID in the ios settings

[tarunkhatri]

Hi @TarekkMA
i am facing same issue, my flutter version is 3.22.0 and firebase_core version is 3.0.0

Can someone please help, trying to figure it out from 2-3 days

the error i am getting is-

flutter: PlatformException(channel-error, Unable to establish connection on channel., null, null)
flutter: #0 FirebaseCoreHostApi.initializeCore (package:firebase_core_platform_interface/src/pigeon/messages.pigeon.dart:210:7)

#1 MethodChannelFirebase._initializeCore (package:firebase_core_platform_interface/src/method_channel/method_channel_firebase.dart:29:44)

#2 MethodChannelFirebase.initializeApp (package:firebase_core_platform_interface/src/method_channel/method_channel_firebase.dart:73:7)

#3 Firebase.initializeApp (package:firebase_core/src/firebase.dart:43:31)

#4 initialChecks (package:creatics_mobile/main.dart:108:3)

#5 main. (package:creatics_mobile/main.dart:75:11)

#6 main (package:creatics_mobile/main.dart:73:3)

[ERROR:flutter/runtime/dart_vm_initializer.cc(41)] Unhandled Exception: [core/no-app] No Firebase App '[DEFAULT]' has been created - call Firebase.initializeApp()
#0 MethodChannelFirebase.app (package:firebase_core_platform_interface/src/method_channel/method_channel_firebase.dart:193:5)
#1 Firebase.app (package:firebase_core/src/firebase.dart:56:41)
#2 FirebaseCrashlytics.instance (package:firebase_crashlytics/src/firebase_crashlytics.dart:33:55)
#3 main. (package:creatics_mobile/main.dart:81:27)
#4 _RootZone.runBinary (dart:async/zone.dart:1666:54)
#5 runZonedGuarded. (dart:async/zone.dart:1798:18)
#6 _Zone._processUncaughtError (dart:async/zone.dart:1081:14)
#7 _CustomZone.handleUncaughtError (dart:async/zone.dart:1285:5)