Flutterfire: firebase_messaging | No implementation found for method FcmDartService

[majdkz97]

Describe the bug
A clear and concise description of what the bug is.
after adding latest firebase_messaging to my app
all is working fine
but after each notification arrive there is this error:

E/flutter ( 3795): [ERROR:flutter/lib/ui/ui_dart_state.cc(157)] Unhandled Exception: MissingPluginException(No implementation found for method FcmDartService#initialized on channel plugins.flutter.io/firebase_messaging_background)
E/flutter ( 3795): #0      MethodChannel.invokeMethod (package:flutter/src/services/platform_channel.dart:319:7)
E/flutter ( 3795): <asynchronous suspension>
E/flutter ( 3795): #1      _fcmSetupBackgroundChannel (package:firebase_messaging/firebase_messaging.dart:50:21)
E/flutter ( 3795): #2      _AsyncAwaitCompleter.start (dart:async-patch/async_patch.dart:45:6)
E/flutter ( 3795): #3      _fcmSetupBackgroundChannel (package:firebase_messaging/firebase_messaging.dart:23:32)
E/flutter ( 3795): #4      _runMainZoned.<anonymous closure>.<anonymous closure> (dart:ui/hooks.dart:239:25)
E/flutter ( 3795): #5      _rootRun (dart:async/zone.dart:1126:13)
E/flutter ( 3795): #6      _CustomZone.run (dart:async/zone.dart:1023:19)
E/flutter ( 3795): #7      _runZoned (dart:async/zone.dart:1518:10)
E/flutter ( 3795): #8      runZoned (dart:async/zone.dart:1502:12)
E/flutter ( 3795): #9      _runMainZoned.<anonymous closure> (dart:ui/hooks.dart:231:5)
E/flutter ( 3795): #10     _startIsolate.<anonymous closure> (dart:isolate-patch/isolate_patch.dart:307:19)
E/flutter ( 3795): #11     _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:174:12)

Flutter doctor:
Doctor summary (to see all details, run flutter doctor -v):
[√] Flutter (Channel stable, v1.12.13+hotfix.7, on Microsoft Windows [Version 10.0.18363.535], locale en-US)

[√] Android toolchain - develop for Android devices (Android SDK version 28.0.3)
[√] Android Studio (version 3.6)
[√] IntelliJ IDEA Community Edition (version 2019.2)
[√] VS Code (version 1.41.1)
[√] Connected device (1 available)

• No issues found!

[iapicca]

Hi @majdkz97
can you please provide your flutter run --verbose
and your pubspec.yaml
or if possible a reproducible minimal code sample.
Thank you

[ericmartineau]

iapicca

The channel method FcmDartService#start is not implement at all on iOS. On iOS, If onBackgroundMessage is provided, an exception will be raised every time.

At a minimum, this exception should be changed to a "not implemented on this platform" type message so consumers know how to adjust their code

[Ehesp]

Going to re-open to track this. It should be handled gracefully on iOS.

[awhitford]

I'm seeing this with Android:

E/flutter (23706): [ERROR:flutter/lib/ui/ui_dart_state.cc(157)] Unhandled Exception: MissingPluginException(No implementation found for method FcmDartService#initialized on channel plugins.flutter.io/firebase_messaging_background)
E/flutter (23706): #0      MethodChannel._invokeMethod (package:flutter/src/services/platform_channel.dart:154:7)
E/flutter (23706): <asynchronous suspension>
E/flutter (23706): #1      MethodChannel.invokeMethod (package:flutter/src/services/platform_channel.dart:329:12)
E/flutter (23706): #2      _fcmSetupBackgroundChannel (package:firebase_messaging/firebase_messaging.dart:50:21)
E/flutter (23706): #3      _runMainZoned.<anonymous closure>.<anonymous closure> (dart:ui/hooks.dart:241:25)
E/flutter (23706): #4      _rootRun (dart:async/zone.dart:1184:13)
E/flutter (23706): #5      _CustomZone.run (dart:async/zone.dart:1077:19)
E/flutter (23706): #6      _runZoned (dart:async/zone.dart:1619:10)
E/flutter (23706): #7      runZonedGuarded (dart:async/zone.dart:1608:12)
E/flutter (23706): #8      _runMainZoned.<anonymous closure> (dart:ui/hooks.dart:233:5)
E/flutter (23706): #9      _startIsolate.<anonymous closure> (dart:isolate-patch/isolate_patch.dart:301:19)
E/flutter (23706): #10     _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:168:12)
E/flutter (23706): 

[Yirmeyah-d]

i had the same error too, but when it comes to me, to solve this I had to remove flutter apns plugin who were disabling fcm plugin.
I didn't see it into your pubspec.yaml but maybe for you it's a another plugin.
Check my GitHub issue :
https://github.com/FirebaseExtended/flutterfire/issues/2878