🐛 [firebase_core] Unable to establish connection on channel

[deepsan98]

Bug report

Describe the bug
When I launch the app, I get the following error:

E/flutter ( 2714): [ERROR:flutter/lib/ui/ui_dart_state.cc(198)] Unhandled Exception: PlatformException(channel-error, Unable to establish connection on channel., null, null)
E/flutter ( 2714): #0      FirebaseCoreHostApi.initializeCore (package:firebase_core_platform_interface/src/pigeon/messages.pigeon.dart:205:7)
E/flutter ( 2714): <asynchronous suspension>
E/flutter ( 2714): #1      MethodChannelFirebase._initializeCore (package:firebase_core_platform_interface/src/method_channel/method_channel_firebase.dart:29:44)
E/flutter ( 2714): <asynchronous suspension>
E/flutter ( 2714): #2      MethodChannelFirebase.initializeApp (package:firebase_core_platform_interface/src/method_channel/method_channel_firebase.dart:73:7)
E/flutter ( 2714): <asynchronous suspension>
E/flutter ( 2714): #3      Firebase.initializeApp (package:firebase_core/src/firebase.dart:42:31)
E/flutter ( 2714): <asynchronous suspension>
E/flutter ( 2714): #4      main (package:falabella/main.dart:31:3)
E/flutter ( 2714): <asynchronous suspension>
E/flutter ( 2714): 

Steps to reproduce

Steps to reproduce the behavior:

1. Add these dependencies in pubspec.yaml:

firebase_core 1.19.1
firebase_crashlytics: ^2.8.4
firebase_analytics: ^9.1.12

2. Launch the app

Expected behavior

The app should launch without any error message.

---

Additional informations

I already have tried putting to put firebase_core_platform_interface: 4.4.1 in dependency_overrides or in dependencies.
I only have 3 firebase packages (mentioned above) and they are all at last version available.

---

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[✓] Flutter (Channel stable, 3.0.2, on macOS 12.0.1 21A559 darwin-arm, locale it-IT)
[✓] Android toolchain - develop for Android devices (Android SDK version 31.0.0)
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[mustafa-707]

same here ! , also im facing a problem with Firebase/Crashlytics in pod install

[!] CocoaPods could not find compatible versions for pod "Firebase/Crashlytics":
  In snapshot (Podfile.lock):
    Firebase/Crashlytics (= 8.15.0)

  In Podfile:
    firebase_crashlytics (from `.symlinks/plugins/firebase_crashlytics/ios`) was resolved to 2.8.5, which depends on
      Firebase/Crashlytics (= 9.2.0)


You have either:
 * changed the constraints of dependency `Firebase/Crashlytics` inside your development pod `firebase_crashlytics`.
   You should run `pod update Firebase/Crashlytics` to apply changes you've made.

[darshankawar]

@deepsan98
Check similar SO link and underlying solution and see if they help : https://stackoverflow.com/questions/72833245/calling-firebase-initializeapp-returns-unable-to-establish-connection-on-chan/72835948#72835948

Also, see if this helps: #9028 (comment)

Moreover, try upgrading all your firebase plugins you are using to latest versions and see if it works:

https://pub.dev/packages/firebase_core/changelog#1192
https://pub.dev/packages/firebase_crashlytics/changelog#285
https://pub.dev/packages/firebase_analytics/changelog#920

Similar issue : #9022

[deepsan98]

@darshankawar I already tried all your suggested solutions before opening this issue.

And, #9022 is not similar to my issue. I don't think the issue described by @mustafa-707 has anything to do with my situation.

[ChristianEdwardPadilla]

Upgrading to the latest releases did not help me either, I am still seeing a PlatformException on call to await Firebase.initializeApp() on Android.

[ChristianEdwardPadilla]

Found the issue for me. It was that firebase_core was not being registered. This was an issue with my specific setup and not a bug with this repo at all. For those running into unexpected PlatformException, consider checking your native registration calls to be sure all your plugins' registerWith calls are being made.

[darshankawar]

@deepsan98 Check above comment / solution and see if its the case with you as well.

[deepsan98]

While waiting for answers, I checked if the error mentioned above is encountered also on Android, but no, on android works fine.
This issue regards only iOS.

---

Found the issue for me. It was that firebase_core was not being registered. This was an issue with my specific setup and not a bug with this repo at all. For those running into unexpected PlatformException, consider checking your native registration calls to be sure all your plugins' registerWith calls are being made.

My GeneratedPluginRegistrant.m file contains these lines, that seem correct to me:

#if __has_include(<firebase_analytics/FLTFirebaseAnalyticsPlugin.h>)
#import <firebase_analytics/FLTFirebaseAnalyticsPlugin.h>
#else
@import firebase_analytics;
#endif

#if __has_include(<firebase_core/FLTFirebaseCorePlugin.h>)
#import <firebase_core/FLTFirebaseCorePlugin.h>
#else
@import firebase_core;
#endif

#if __has_include(<firebase_crashlytics/FLTFirebaseCrashlyticsPlugin.h>)
#import <firebase_crashlytics/FLTFirebaseCrashlyticsPlugin.h>
#else
@import firebase_crashlytics;
#endif

and the method registerWithRegistry contains:

[FLTFirebaseAnalyticsPlugin registerWithRegistrar:[registry registrarForPlugin:@"FLTFirebaseAnalyticsPlugin"]];
[FLTFirebaseCorePlugin registerWithRegistrar:[registry registrarForPlugin:@"FLTFirebaseCorePlugin"]];
[FLTFirebaseCrashlyticsPlugin registerWithRegistrar:[registry registrarForPlugin:@"FLTFirebaseCrashlyticsPlugin"]];

so the native calls seem fine to me.

[darshankawar]

Thanks for the update @deepsan98
I actually hit this error while running a sample firebase_remote_config example which had following dependencies:

firebase_core and firebase_remote_config and were on old versions. When I only updated firebase_remote_config to latest but kept firebase_core as-is, I got the same error as you reported:

console error log

Launching lib/main.dart on iPhone 13 in debug mode...
Upgrading AppFrameworkInfo.plist
Upgrading Podfile
Upgrading Info.plist
Running pod install...
Running Xcode build...
Xcode build done.                                           61.3s
Debug service listening on ws://127.0.0.1:52412/10T1n91UcO8=/ws
Syncing files to device iPhone 13...
[VERBOSE-2: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:205:7)
<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:42:31)
<asynchronous suspension>
#4      setupRemoteConfig (package:triage/main.dart:79:3)
<asynchronous suspension>

But when I upgraded firebase_core to latest version, ran again, it compiled and built the app properly:

  Launching lib/main.dart on iPhone 13 in debug mode...
Running Xcode build...
Xcode build done.                                           16.2s
Debug service listening on ws://127.0.0.1:52765/CPDnXJDu5lY=/ws
Syncing files to device iPhone 13...

So after upgrading plugin versions, try deleting the podfile.lock and then try running again and see if it helps.

[deepsan98]

I already updated all firebase dependencies to latest version and also tried to delete podfile.lock

Still not working

[darshankawar]

firebase_core 1.19.1

I see that you are using direct plugin version and not with a caret sign (^) ? Is it a typo or purposely ?

Can you try using firebase_core: ^1.19.2 and confirm ?

[deepsan98]

It is a typo. I am currently using firebase_core: ^1.19.2.

[deepsan98]

I finally managed to solve this issue. Looking at pubspec.lock turns out a dependency (flutter_apns) was using an older version of firebase_messaging and it was not updated with pub upgrade because of some conflicts.

Removing flutter_apns solved my situation.

[KKimj]

Hello folks!

Can I use only latest version of Firebase Core, 1.19.2?

I want to use firebase_core: 1.18.0, because of pre-compiled firebase-ios-sdk by invertase/firestore-ios-sdk-frameworks.

I encounter same error, ( Unable to establish connection .. ) on firebase core 1.18.0!

Thanks!!