FlutterFcmService("number"): Fatal: failed to find callback

Question

I am using firebase_messaging: ^6.0.16 package, and I did everything that was required of me, and after I sending the firebase message, I got this error :

FlutterFcmService(12133): Fatal: Failed to find callback

I searched for this issue but got nothing

I found one solution but it did not help me, solution

any help, thank you...

I use same the example code in the package, https://pub.dev/packages/firebase_messaging#-readme-tab-, and I added the breakpoints in everywhere — farouk osama, Jul 14 '20 at 19:36
Make sure that you listen to the notifications when starting the application. — farouk osama, Aug 17 '20 at 02:36
I get notifications working, but I am also seeing random (infrequent) crashes that I think are related to this same function: " public static void startBackgroundIsolate(Context context, long callbackHandle)". Please share if you find any fix to this — Eradicatore, Oct 29 '20 at 19:07

score 3 · Answer 1 · answered Nov 03 '20 at 12:58

3

Following this answer helped me solve the issue: https://stackoverflow.com/a/64483134/2931049

Please note the onBackgroundMessage part. Not implementing it as well as the others gave me the Failed to find callback error

answered Nov 03 '20 at 12:58

Yumi H

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score 1 · Answer 2 · answered Nov 11 '20 at 06:33

1

Replace GeneratedPluginRegistrant.registerWith(registry); with

FirebaseMessagingPlugin.registerWith(registry.registrarFor("io.flutter.plugins.firebasemessaging.FirebaseMessagingPlugin"));

Please check this code

answered Nov 11 '20 at 06:33

Vettiyanakan

7,957
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FlutterFcmService("number"): Fatal: failed to find callback

2 Answers2