flutter: Fatal Error: Callback lookup failed! #344

gustavobrian · 2019-12-02T20:07:02Z

console log print everytime Fatal Error: Callback lookup failed!
flutter stable channel
version audioplayers: ^0.13.3

Thanks!

imaNNeo · 2019-12-03T19:35:44Z

I have this issue too

JonathanIvyCR · 2019-12-04T03:14:11Z

I'm also getting this error. It doesn't seem to cause any problem and the audio plays.

pobrejuanito · 2019-12-04T15:08:59Z

For me it happens when audio completes.

JesseScott · 2019-12-05T04:56:56Z

think this is fixed in #332

luanpotter · 2019-12-05T13:43:15Z

merged #332, released on 0.13.5, thanks @JesseScott

volgin · 2020-01-27T05:17:52Z

I see this error in 0.14.0 version.

I call setNotification(), and the correct information appears in the Command Center and Notifications on iPhone. Any attempt to click on a pause/play button in the Command Center or Notifications causes this message:
Fatal Error: Callback lookup failed!

Interestingly, onNotificationPlayerStateChanged() is called with the correct state despite this error message. When a file is playing from a URL, the app continues to work, but with a local file this error crashes the app.

AatiqUrRehman · 2020-03-24T14:57:57Z

any solution yet? getting same error

tko2100 · 2020-03-28T17:25:46Z

Same here. Anyone have a solution?

nohli · 2020-03-29T10:08:13Z

My app works fine (is playing all local sounds), but shows this error in console shortly after every sound.

DenisPushkarev · 2020-04-01T11:55:39Z

Same here,
getting
flutter: onNotificationPlayerStateChanged!
flutter: Fatal Error: Callback lookup failed!
Seems like audioPlayer.onPlayerStateChanged.listen((state) callback doesn't work.

handofthecode · 2020-04-04T18:14:30Z

Same issue here. latest version.

lukepighetti · 2020-04-05T01:18:22Z

Same issue here, latest version. All I'm doing is playing a sound. It happens when it completes.

import 'package:audioplayers/audio_cache.dart';
import 'package:audioplayers/audioplayers.dart';
import 'package:ptp/config.dart';

class SoundService {
  SoundService() {
    player.loadAll(AppConfig.toneOptions.values.withoutAssetOnFront);
  }

  static final player = AudioCache();

  void play(String path) async {
    player.play(path.withoutAssetOnFront, mode: PlayerMode.LOW_LATENCY);
  }
}

extension on Iterable<String> {
  List<String> get withoutAssetOnFront =>
      this.map((e) => e.withoutAssetOnFront).toList();
}

extension on String {
  String get withoutAssetOnFront => this.replaceFirst("assets/", "");
}

flutter: Fatal Error: Callback lookup failed!
flutter: Fatal Error: Callback lookup failed!
flutter: Fatal Error: Callback lookup failed!
flutter: Fatal Error: Callback lookup failed!
flutter: Fatal Error: Callback lookup failed!
flutter: Fatal Error: Callback lookup failed!
flutter: Fatal Error: Callback lookup failed!
flutter: Fatal Error: Callback lookup failed!
flutter: Fatal Error: Callback lookup failed!

lukepighetti · 2020-04-05T01:19:03Z

@luanpotter please reopen

chancelorb · 2020-04-05T02:45:33Z

Same issue, I am using the latest version.

alanmeier · 2020-04-05T08:09:09Z

It also happens using the example on GitHub as well

mirkopoloni · 2020-04-05T23:02:33Z

I do also get the same error.

Version
0.15.0

Where
iPad 7th generation - iOS Simulator

When
When a file (from local assets) finishes playing.

More infos

I'm using AudioCache.
The error occurs with both play and loop

Error log
The error I get is:

Exception has occurred.
NoSuchMethodError (NoSuchMethodError: The method 'call' was called on null.
Receiver: null
Tried calling: call(Instance of 'AudioPlayerState'))

From
_backgroundCallbackDispatcher.<anonymous closure> (audioplayers-0.15.0/lib/audioplayers.dart:116)

if (call.method == 'audio.onNotificationBackgroundPlayerStateChanged') {
      onAudioChangeBackgroundEvent ??= _performCallbackLookup();
      final String playerState = callArgs['value'];
      if (playerState == 'playing') {
        onAudioChangeBackgroundEvent(AudioPlayerState.PLAYING);
      } else if (playerState == 'paused') {
        onAudioChangeBackgroundEvent(AudioPlayerState.PAUSED);
      } else if (playerState == 'completed') {
        onAudioChangeBackgroundEvent(AudioPlayerState.COMPLETED);
      }
    }

onAudioChangeBackgroundEvent is null.

orestesgaolin · 2020-04-08T13:40:29Z

Yup, getting the same error as above

ricnaaru · 2020-04-09T05:46:37Z

i've solved the issue by calling the "monitorNotificationStateChanges" method and passing the static function into it

nohli · 2020-04-09T07:26:03Z

i've solved the issue by calling the "monitorNotificationStateChanges" method and passing the static function into it

Could you please post the code of that fix, or even submit a pull request? 😊

ricnaaru · 2020-04-11T11:33:54Z

just add this script

audioPlayer.monitorNotificationStateChanges(monitorNotificationStateHandler);

and dont forget to add the handler method to be static / top level function (outside of your class), so it could be accessed from the headless state

static method

static void x(AudioPlayerState value) {
    print("state => $value");
  }

top-level function

void x(AudioPlayerState value) {
    print("state => $value");
}
  
class Test extends StatefulWidget{
    ...
}

Please note to match the return type and the argument type, otherwise it won't work

nimisis · 2020-04-17T15:46:22Z

just add this script

audioPlayer.monitorNotificationStateChanges(monitorNotificationStateHandler);

This causes a problem in Android for me:

MissingPluginException(No implementation found for method monitorNotificationStateChanges on channel xyz.luan/audioplayers)

nohli · 2020-04-17T18:15:24Z

just add this script
audioPlayer.monitorNotificationStateChanges(monitorNotificationStateHandler);

This causes a problem in Android for me:

MissingPluginException(No implementation found for method monitorNotificationStateChanges on channel xyz.luan/audioplayers)

You can add:

import 'dart:io';

if (Platform.isIOS) ...

vinnytwice · 2020-04-27T17:14:32Z

@nohli Hi I'm another one facing this error..
I'm using AudioCache() to play local files And I tried your fix with this code:

 void audioPlayerHandler(AudioPlayerState value) {
    print("state => $value");
  }

  @override
  Widget build(BuildContext context) {
    AudioCache cache = new AudioCache();
    AudioPlayer audioPlayer = new AudioPlayer();
    Platform.isIOS
        ? audioPlayer.monitorNotificationStateChanges(audioPlayerHandler)
        // ignore: unnecessary_statements
        : () {};

but I now get
this periodically:

[VERBOSE-2:ui_dart_state.cc(157)] Unhandled Exception: NoSuchMethodError: The method 'toRawHandle' was called on null.
Receiver: null
Tried calling: toRawHandle()
#0 Object.noSuchMethod (dart:core-patch/object_patch.dart:53:5)
#1 AudioPlayer.monitorNotificationStateChanges (package:audioplayers/audioplayers.dart:354:44)
#2 _MapScreenState.build (package:fixit_cloud_biking/Screens/map_screen.dart:221:23)
#3 StatefulElement.build (package:flutter/src/widgets/framework.dart:4334:27)
#4 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4223:15)
#5 Element.rebuild (package:flutter/src/widgets/framework.dart:3947:5)
#6 BuildOwner.buildScope (package:flutter/src/widgets/framework.dart:2432:33)
#7 WidgetsBinding.drawFrame (package:flutter/src/widgets/binding.dart:773:20)
#8 RendererBinding._handlePersistentFrameCallback (package:flutter/src/rendering/binding.dart:283:5)
#9 SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1102:15)
#10 SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:1041:9)
#11 SchedulerBinding._handleDrawFrame (package:flutter/src/scheduler/binding.dart:957:5)
#12 _rootRun (dart:async/zone.dart:1126:13)
#13 _CustomZone.run (dart:async/zone.dart:1023:19)
#14 _CustomZone.runGuarded (dart:async/zone.dart:925:7)
#15 _invoke (dart:ui/hooks.dart:259:10)
#16 _drawFrame (dart:ui/hooks.dart:217:3)

not sure of what I'm doing dough..is this what you meant? I had to create an instance of AudioPlayer() as your fix was about it and not about AudioCache().
Is there a different fix for it?
Thank you very much

nohli · 2020-04-27T17:57:49Z

@vinnytwice I can give you my code which is working:

// during first app start i once call:
// if (Platform.isIOS) audioPlayerStateMonitor();

void audioPlayerStateMonitor() =>
    _audioPlayer.monitorNotificationStateChanges(_audioPlayerStateUpdate);

void _audioPlayerStateUpdate(AudioPlayerState state) => state;

AudioPlayer _audioPlayer = AudioPlayer(mode: PlayerMode.LOW_LATENCY);

AudioCache _player = AudioCache(fixedPlayer: _audioPlayer);

// this could be written more verbose and easier to read
Future<void> sound(String sound) async => _audioPlayerStateUpdate((await _player.play(sound)).state);

miguelpruivo · 2020-04-29T16:30:52Z

Same issue while using AudioCache only. This probably should be reopened.

ghost · 2020-05-05T00:57:08Z

Tried will all the methods still the issue persists.
I am trying to run on iPhone 11 pro max simulator. Help !!

nohli · 2020-05-05T07:02:13Z

@krishnatandon1208 can you share your code?

xni06 · 2020-07-23T06:30:55Z

Any updates on this? This is a huge problem.

Did you try the solutions above? They worked for me. This is what I'm using:

import 'dart:io';

import 'package:audioplayers/audio_cache.dart';
import 'package:audioplayers/audioplayers.dart';

class Audio {
  static bool mute = false;

  AudioCache _audioCache;
  AudioPlayer _audioPlayer;

  Audio() {
    AudioPlayer.logEnabled = false;
    _audioPlayer = AudioPlayer(mode: PlayerMode.MEDIA_PLAYER);
    _audioCache = AudioCache(prefix: 'sounds/', fixedPlayer: _audioPlayer);
    _fixCallbackLookupFailedIssue();
  }

  // https://github.com/luanpotter/audioplayers/issues/344
  void _fixCallbackLookupFailedIssue() {
    if (Platform.isIOS) {
      _audioPlayer
          .monitorNotificationStateChanges(_audioPlayerStateChangeHandler);
    }
  }

  void start(String filename) {
    if (!mute) _audioCache.play(filename);
  }

  void loop(String filename) {
    if (!mute) _audioCache.loop(filename);
  }

  void stop() => _audioPlayer.stop();

  Future<void> dispose() async {
    await _audioPlayer.pause();
    await _audioPlayer.dispose();
  }
}

void _audioPlayerStateChangeHandler(AudioPlayerState state) => null;

pawansgithub · 2020-07-28T18:19:31Z

Here is the solution:
click on pubspec.yaml file and change the audioplayers version to audioplayers: ^0.10.0 and click pubset
then 0.10.0 version will be download to External Libraries.

Now the problem will sloved.....!!!

xni06 · 2020-07-28T18:47:54Z

Here is the solution:
click on pubspec.yaml file and change the audioplayers version to audioplayers: ^0.10.0 and click pubset
then 0.10.0 version will be download to External Libraries.

Now the problem will sloved.....!!!

Reverting back to a release that was made 18 months ago and is 17 releases behind the current release? :-/

Why not use one of the above solutions along with the current release such as #344 (comment) ?

pawansgithub · 2020-07-28T19:39:58Z

Here is the solution:
click on pubspec.yaml file and change the audioplayers version to audioplayers: ^0.10.0 and click pubset
then 0.10.0 version will be download to External Libraries.

Now the problem will sloved.....!!!

Reverting back to a release that was made 18 months ago and is 17 releases behind the current release? :-/

Why not use one of the above solutions along with the current release such as #344 (comment) ?

I appreciate your code but for the beginners enough thing to get rid of errors in #terminal

LugonjaAleksandar · 2020-07-28T19:44:42Z

Here is the solution:
click on pubspec.yaml file and change the audioplayers version to audioplayers: ^0.10.0 and click pubset
then 0.10.0 version will be download to External Libraries.

Now the problem will sloved.....!!!

Reverting back to a release that was made 18 months ago and is 17 releases behind the current release? :-/
Why not use one of the above solutions along with the current release such as #344 (comment) ?

I appreciate your code but for the beginners enough thing to get rid of errors in #terminal

By downgrading 10 versions of this plugin, you just introduced at least 10 new errors to the system because all those releases in the mean time were bug fixes...it is fine enough if you get a warning in the console about this, but something completely different if you get real errors if you discard 8 months of code development from library maintainers. Be careful :)

pawansgithub · 2020-07-28T20:15:32Z

Here is the solution:
click on pubspec.yaml file and change the audioplayers version to audioplayers: ^0.10.0 and click pubset
then 0.10.0 version will be download to External Libraries.

Now the problem will sloved.....!!!

Reverting back to a release that was made 18 months ago and is 17 releases behind the current release? :-/
Why not use one of the above solutions along with the current release such as #344 (comment) ?

I appreciate your code but for the beginners enough thing to get rid of errors in #terminal

By downgrading 10 versions of this plugin, you just introduced at least 10 new errors to the system because all those releases in the mean time were bug fixes...it is fine enough if you get a warning in the console about this, but something completely different if you get real errors if you discard 8 months of code development from library maintainers. Be careful :)

then you should wait for the new release....hope they fix the problem regarding this issue.
just i tried my level best for the error free in the terminal and application is running fine...!!!!

erickzanardo · 2020-07-28T20:22:26Z

Folks can someone confirm if this is still happening, and if so, can someone provide a simple code that reproduces this problem? I may try to take a look on this...

pawansgithub · 2020-07-28T20:41:11Z

Folks can someone confirm if this is still happening, and if so, can someone provide a simple code that reproduces this problem? I may try to take a look on this...

yes it is repeating same problem because of new update...!

xni06 · 2020-07-28T21:03:06Z

Folks can someone confirm if this is still happening, and if so, can someone provide a simple code that reproduces this problem? I may try to take a look on this...

I am using the latest release and do not have the problem when using the suggested solution as per #344 (comment)

ventr1x · 2020-08-12T12:12:12Z

How is this closed and considered fixed?

So we need to check for platform (because Android would crash with the "solution").
Fix this on every app with boilerplate code because the plugin does not simply check if a callback function is present.
Let every new user figure out by themselves where this error is coming from and how to find the fix buried in github.

Good work!

Not sure what test someone needs to reproduce.
I get that error on newest version on every .play() call. While AudioCache itself does not even expose any callback(?), so the fix does not apply.

Simple small service:

import 'dart:core';
import 'package:audioplayers/audio_cache.dart';

class Audio {
  final player = AudioCache();

  static final Audio _singleton = Audio._internal();

  factory Audio() {
    return _singleton;
  }

  Audio._internal();

  play(String audioFile) {
    player.play(audioFile);
  }
}

Even with the fix put onto Audioplayer (which I'm not using in my small example), the error still persists:

import 'dart:core';
import 'dart:io';
import 'package:audioplayers/audio_cache.dart';
import 'package:audioplayers/audioplayers.dart';

class Audio {
  AudioPlayer _audioPlayer;
  AudioCache _player;

  static final Audio _singleton = Audio._internal();

  factory Audio() {
    return _singleton;
  }

  Audio._internal() {
    _player = AudioCache();
    _audioPlayer = AudioPlayer();
    _fixCallbackLookupFailedIssue();
  }

  play(String audioFile) {
    _player.play(audioFile);
  }

  void _fixCallbackLookupFailedIssue() {
    if (Platform.isIOS) {
      _audioPlayer.monitorNotificationStateChanges(_audioPlayerStateChangeHandler);
    }
  }

  void _audioPlayerStateChangeHandler(AudioPlayerState state) => null;
}

Adding the fix (when using audioplayer instead of audiocache) also throws this error about 80% of the time (mentioned here and ignored...):

[VERBOSE-2:ui_dart_state.cc(157)] Unhandled Exception: NoSuchMethodError: The method 'toRawHandle' was called on null.
Receiver: null
Tried calling: toRawHandle()
#0      Object.noSuchMethod (dart:core-patch/object_patch.dart:53:5)
#1      AudioPlayer.monitorNotificationStateChanges (package:audioplayers/audioplayers.dart:354:44)
#2      Audio._fixCallbackLookupFailedIssue (package:x/utils/audio.util.dart:32:20)
#3      new Audio._internal (package:x/utils/audio.util.dart:20:5)
#4      Audio._singleton (package:x/utils/audio.util.dart:11:41)
#5      Audio._singleton (package:x/utils/audio.util.dart:11:22)
#6      new Audio (package:x/utils/audio.util.dart:14:12)
#7      _ClickableState._onTap (package:x/widgets/clickable.dart:36:5)
#8      GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:182:24)
#9      TapGestureRecognizer.handleTapUp (package:flutter/src/gestures/tap.dart:504:11)
#10     BaseTapGestureRecognizer._checkUp <…>

erickzanardo · 2020-08-12T12:29:35Z

How is this closed and considered fixed?

So we need to check for platform (because Android would crash with the "solution").
Fix this on every app with boilerplate code because the plugin does not simply check if a callback function is present.
Let every new user figure out by themselves where this error is coming from and how to find the fix buried in github.

Good work!

Not sure what test someone needs to reproduce.
I get that error on newest version on every .play() call. While AudioCache itself does not even expose any callback(?), so the fix does not apply.

Simple small service:

import 'dart:core';
import 'package:audioplayers/audio_cache.dart';

class Audio {
  final player = AudioCache();

  static final Audio _singleton = Audio._internal();

  factory Audio() {
    return _singleton;
  }

  Audio._internal();

  play(String audioFile) {
    player.play(audioFile);
  }
}

Even with the fix put onto Audioplayer (which I'm not using in my small example), the error still persists:

import 'dart:core';
import 'dart:io';
import 'package:audioplayers/audio_cache.dart';
import 'package:audioplayers/audioplayers.dart';

class Audio {
  AudioPlayer _audioPlayer;
  AudioCache _player;

  static final Audio _singleton = Audio._internal();

  factory Audio() {
    return _singleton;
  }

  Audio._internal() {
    _player = AudioCache();
    _audioPlayer = AudioPlayer();
    _fixCallbackLookupFailedIssue();
  }

  play(String audioFile) {
    _player.play(audioFile);
  }

  void _fixCallbackLookupFailedIssue() {
    if (Platform.isIOS) {
      _audioPlayer.monitorNotificationStateChanges(_audioPlayerStateChangeHandler);
    }
  }

  void _audioPlayerStateChangeHandler(AudioPlayerState state) => null;
}

Adding the fix (when using audioplayer instead of audiocache) also throws this error about 80% of the time (mentioned here and ignored...):

[VERBOSE-2:ui_dart_state.cc(157)] Unhandled Exception: NoSuchMethodError: The method 'toRawHandle' was called on null.
Receiver: null
Tried calling: toRawHandle()
#0      Object.noSuchMethod (dart:core-patch/object_patch.dart:53:5)
#1      AudioPlayer.monitorNotificationStateChanges (package:audioplayers/audioplayers.dart:354:44)
#2      Audio._fixCallbackLookupFailedIssue (package:x/utils/audio.util.dart:32:20)
#3      new Audio._internal (package:x/utils/audio.util.dart:20:5)
#4      Audio._singleton (package:x/utils/audio.util.dart:11:41)
#5      Audio._singleton (package:x/utils/audio.util.dart:11:22)
#6      new Audio (package:x/utils/audio.util.dart:14:12)
#7      _ClickableState._onTap (package:x/widgets/clickable.dart:36:5)
#8      GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:182:24)
#9      TapGestureRecognizer.handleTapUp (package:flutter/src/gestures/tap.dart:504:11)
#10     BaseTapGestureRecognizer._checkUp <…>

This isn't closed, the issue is still open 🤔

xni06 · 2020-08-12T13:13:10Z

How is this closed and considered fixed?

So we need to check for platform (because Android would crash with the "solution").
Fix this on every app with boilerplate code because the plugin does not simply check if a callback function is present.
Let every new user figure out by themselves where this error is coming from and how to find the fix buried in github.

Good work!

Not sure what test someone needs to reproduce.
I get that error on newest version on every .play() call. While AudioCache itself does not even expose any callback(?), so the fix does not apply.

Simple small service:

import 'dart:core';
import 'package:audioplayers/audio_cache.dart';

class Audio {
  final player = AudioCache();

  static final Audio _singleton = Audio._internal();

  factory Audio() {
    return _singleton;
  }

  Audio._internal();

  play(String audioFile) {
    player.play(audioFile);
  }
}

Even with the fix put onto Audioplayer (which I'm not using in my small example), the error still persists:

import 'dart:core';
import 'dart:io';
import 'package:audioplayers/audio_cache.dart';
import 'package:audioplayers/audioplayers.dart';

class Audio {
  AudioPlayer _audioPlayer;
  AudioCache _player;

  static final Audio _singleton = Audio._internal();

  factory Audio() {
    return _singleton;
  }

  Audio._internal() {
    _player = AudioCache();
    _audioPlayer = AudioPlayer();
    _fixCallbackLookupFailedIssue();
  }

  play(String audioFile) {
    _player.play(audioFile);
  }

  void _fixCallbackLookupFailedIssue() {
    if (Platform.isIOS) {
      _audioPlayer.monitorNotificationStateChanges(_audioPlayerStateChangeHandler);
    }
  }

  void _audioPlayerStateChangeHandler(AudioPlayerState state) => null;
}

Adding the fix (when using audioplayer instead of audiocache) also throws this error about 80% of the time (mentioned here and ignored...):

[VERBOSE-2:ui_dart_state.cc(157)] Unhandled Exception: NoSuchMethodError: The method 'toRawHandle' was called on null.
Receiver: null
Tried calling: toRawHandle()
#0      Object.noSuchMethod (dart:core-patch/object_patch.dart:53:5)
#1      AudioPlayer.monitorNotificationStateChanges (package:audioplayers/audioplayers.dart:354:44)
#2      Audio._fixCallbackLookupFailedIssue (package:x/utils/audio.util.dart:32:20)
#3      new Audio._internal (package:x/utils/audio.util.dart:20:5)
#4      Audio._singleton (package:x/utils/audio.util.dart:11:41)
#5      Audio._singleton (package:x/utils/audio.util.dart:11:22)
#6      new Audio (package:x/utils/audio.util.dart:14:12)
#7      _ClickableState._onTap (package:x/widgets/clickable.dart:36:5)
#8      GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:182:24)
#9      TapGestureRecognizer.handleTapUp (package:flutter/src/gestures/tap.dart:504:11)
#10     BaseTapGestureRecognizer._checkUp <…>

From a cursory glance between your code and the workaround, I can see that you're not setting the fixedPlayer when creating the AudioCache...

_audioCache = AudioCache(prefix: 'sounds/', fixedPlayer: _audioPlayer);

chornbe · 2020-08-12T13:29:42Z

Doesn’t that kind of go directly to his point though? Seems from the discussions, that a simple null check would prevent a complete hard-out crash. Some sort of error-indicative return from the various calls - if necessary - could easily say ‘hey, you can’t do that without...’ rather than a hard crash with poorly documented features / object dependencies. No crash code with proper error indicative responses is always the better choice. Crash code can equal vulnerabilities, and just feels unpolished and incomplete.

…

On Aug 12, 2020, at 9:13 AM, Rhisiart ap Gwilym ***@***.***> wrote: How is this closed and considered fixed? So we need to check for platform (because Android would crash with the "solution"). Fix this on every app with boilerplate code because the plugin does not simply check if a callback function is present. Let every new user figure out by themselves where this error is coming from and how to find the fix buried in github. Good work! Not sure what test someone needs to reproduce. I get that error on newest version on every .play() call. While AudioCache itself does not even expose any callback(?), so the fix does not apply. Simple small service: import 'dart:core'; import 'package:audioplayers/audio_cache.dart'; class Audio { final player = AudioCache(); static final Audio _singleton = Audio._internal(); factory Audio() { return _singleton; } Audio._internal(); play(String audioFile) { player.play(audioFile); } } Even with the fix put onto Audioplayer (which I'm not using in my small example), the error still persists: import 'dart:core'; import 'dart:io'; import 'package:audioplayers/audio_cache.dart'; import 'package:audioplayers/audioplayers.dart'; class Audio { AudioPlayer _audioPlayer; AudioCache _player; static final Audio _singleton = Audio._internal(); factory Audio() { return _singleton; } Audio._internal() { _player = AudioCache(); _audioPlayer = AudioPlayer(); _fixCallbackLookupFailedIssue(); } play(String audioFile) { _player.play(audioFile); } void _fixCallbackLookupFailedIssue() { if (Platform.isIOS) { _audioPlayer.monitorNotificationStateChanges(_audioPlayerStateChangeHandler); } } void _audioPlayerStateChangeHandler(AudioPlayerState state) => null; } Adding the fix (when using audioplayer instead of audiocache) also throws this error about 80% of the time (mentioned here and ignored...): [VERBOSE-2:ui_dart_state.cc(157)] Unhandled Exception: NoSuchMethodError: The method 'toRawHandle' was called on null. Receiver: null Tried calling: toRawHandle() #0 Object.noSuchMethod (dart:core-patch/object_patch.dart:53:5) #1 AudioPlayer.monitorNotificationStateChanges (package:audioplayers/audioplayers.dart:354:44) #2 Audio._fixCallbackLookupFailedIssue (package:x/utils/audio.util.dart:32:20) #3 new Audio._internal (package:x/utils/audio.util.dart:20:5) #4 Audio._singleton (package:x/utils/audio.util.dart:11:41) #5 Audio._singleton (package:x/utils/audio.util.dart:11:22) #6 new Audio (package:x/utils/audio.util.dart:14:12) #7 _ClickableState._onTap (package:x/widgets/clickable.dart:36:5) #8 GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:182:24) #9 TapGestureRecognizer.handleTapUp (package:flutter/src/gestures/tap.dart:504:11) #10 BaseTapGestureRecognizer._checkUp <…> From a cursory glance between your code and the #344 example, I can see that you're not setting the fixedPlayer when you're creating the AudioCache... _audioCache = AudioCache(prefix: 'sounds/', fixedPlayer: _audioPlayer); — You are receiving this because you commented. Reply to this email directly, view it on GitHub, or unsubscribe.

ventr1x · 2020-08-12T13:33:53Z

From a cursory glance between your code and the workaround, I can see that you're not setting the fixedPlayer when creating the AudioCache...

You're right, but it doesn't change much as it then runs into the toRawHandle exception as mentioned.

erickzanardo · 2020-08-12T13:36:31Z

Folks can someone confirm if this is still happening, and if so, can someone provide a simple code that reproduces this problem? I may try to take a look on this...

Quoting my own message, if someone could provide a simple code that reproduce this, I could try giving a look, I have tried reproducing this on our example app and I am not been able to see this problem happening.

xni06 · 2020-08-12T13:50:14Z

Folks can someone confirm if this is still happening, and if so, can someone provide a simple code that reproduces this problem? I may try to take a look on this...

Quoting my own message, if someone could provide a simple code that reproduce this, I could try giving a look, I have tried reproducing this on our example app and I am not been able to see this problem happening.

Better still, a full repo.

ventr1x · 2020-08-12T17:04:07Z

Didn't I do that?

There is no error being thrown in the app itself but the log bubbles up. So it's annoying, but doesn't kill the app itself.
The other exception though is killing the app.

xni06 · 2020-08-12T17:46:30Z

Please provide a working Flutter repo that we can clone so that we reproduce the error along with flutter doctor output and the device that you are testing against - thanks.

m-j-g · 2020-08-20T13:03:27Z

I'm getting the same error using AudioCache.play()

flutter: Fatal Error: Callback lookup failed!

xni06 · 2020-08-20T13:20:42Z

I'm getting the same error using AudioCache.play()

flutter: Fatal Error: Callback lookup failed!

#344 (comment)

jb-thery · 2020-09-11T19:09:23Z

Hi,

@xni06 I' have the same error using AudioCache.play() with audioplayers: 0.16.1.

flutter: Fatal Error: Callback lookup failed!

Repo for bug reproduction :
https://github.com/jbty/flutter_xylophone

Device tested :
Simulator iOS 13.7 Iphone 11

Flutter doctor output :

Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, 1.20.3, on Mac OS X 10.15.6 19G2021, locale fr-FR)
 
[✓] Android toolchain - develop for Android devices (Android SDK version 30.0.2)
[✓] Xcode - develop for iOS and macOS (Xcode 11.7)
[✓] Android Studio (version 4.0)
[✓] Connected device (1 available)

• No issues found!

Have a nice day

xni06 · 2020-09-11T20:03:58Z

@xni06 I' have the same error using AudioCache.play() with audioplayers: 0.16.1.

flutter: Fatal Error: Callback lookup failed!

Repo for bug reproduction :
https://github.com/jbty/flutter_xylophone

Device tested :
Simulator iOS 13.7 Iphone 11

Flutter doctor output :
Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel stable, 1.20.3, on Mac OS X 10.15.6 19G2021, locale fr-FR)
 
[✓] Android toolchain - develop for Android devices (Android SDK version 30.0.2)
[✓] Xcode - develop for iOS and macOS (Xcode 11.7)
[✓] Android Studio (version 4.0)
[✓] Connected device (1 available)

• No issues found!
Have a nice day

Thanks for the repo - perfect. Here are the steps that I took a few moments ago...

Cloned your repo
Launched an iOS 13.7 Iphone 11 simulator
flutter pub get then flutter run
I was able to replicate the problem i.e. flutter: Fatal Error: Callback lookup failed!
I applied the fix as per flutter: Fatal Error: Callback lookup failed! #344 (comment)
Hit Control-R and... it worked

I note that your code did not have the suggested fix - did you try it before posting?

jb-thery · 2020-09-12T10:59:23Z

@xni06 Your temporary fix work for me:) I hope this bug will'be fixed for the last version of this awesome package 🙂

denizdogan · 2020-09-12T22:54:34Z

@xni06 Maybe that works for AudioPlayer, but AudioCache (which is required for using assets) doesn't have monitorNotificationStateChanges.

Just so that everyone is clear on this, this doesn't really crash anything, it just prints a message.

xni06 · 2020-09-13T08:35:44Z

@denizdogan

@xni06 Maybe that works for AudioPlayer, but AudioCache (which is required for using assets) doesn't have monitorNotificationStateChanges.

Create an AudioPlayer
Create an AudioCache and inject the AudioPlayer into it via the constructor
Apply the fix i.e. call monitorNotificationStateChanges on the injected AudioPlayer

  AudioCache _audioCache;
  AudioPlayer _audioPlayer;

  Audio() {
    AudioPlayer.logEnabled = false;
    _audioPlayer = AudioPlayer(mode: PlayerMode.MEDIA_PLAYER);
    _audioCache = AudioCache(prefix: 'sounds/', fixedPlayer: _audioPlayer);
    _fixCallbackLookupFailedIssue();
  }

  // https://github.com/luanpotter/audioplayers/issues/344
  void _fixCallbackLookupFailedIssue() {
    if (Platform.isIOS) {
      _audioPlayer
          .monitorNotificationStateChanges(_audioPlayerStateChangeHandler);
    }
  }

blueflamer · 2020-09-18T13:24:57Z

Any updates on this? This is a huge problem.

Did you try the solutions above? They worked for me. This is what I'm using:

import 'dart:io';

import 'package:audioplayers/audio_cache.dart';
import 'package:audioplayers/audioplayers.dart';

class Audio {
  static bool mute = false;

  AudioCache _audioCache;
  AudioPlayer _audioPlayer;

  Audio() {
    AudioPlayer.logEnabled = false;
    _audioPlayer = AudioPlayer(mode: PlayerMode.MEDIA_PLAYER);
    _audioCache = AudioCache(prefix: 'sounds/', fixedPlayer: _audioPlayer);
    _fixCallbackLookupFailedIssue();
  }

  // https://github.com/luanpotter/audioplayers/issues/344
  void _fixCallbackLookupFailedIssue() {
    if (Platform.isIOS) {
      _audioPlayer
          .monitorNotificationStateChanges(_audioPlayerStateChangeHandler);
    }
  }

  void start(String filename) {
    if (!mute) _audioCache.play(filename);
  }

  void loop(String filename) {
    if (!mute) _audioCache.loop(filename);
  }

  void stop() => _audioPlayer.stop();

  Future<void> dispose() async {
    await _audioPlayer.pause();
    await _audioPlayer.dispose();
  }
}

void _audioPlayerStateChangeHandler(AudioPlayerState state) => null;

BTW ensure this function is outside of Audio class.

void _audioPlayerStateChangeHandler(AudioPlayerState state) => null;

erickzanardo · 2021-04-10T14:37:00Z

Closing this due to reports of this being fixed on newer versions. Feel free to open a new issue in case of this still happening

luanpotter closed this as completed Dec 5, 2019

This was referenced May 2, 2020

Unhandled Exception: MissingPluginException(No implementation found for method play on channel xyz.luan/audioplayers) #518

Closed

Unhandled Exception: MissingPluginException(No implementation found for method play on channel xyz.luan/audioplayers) #519

Closed

thlvu added a commit to thlvu/xylophone-flutter that referenced this issue Sep 15, 2020

fix audioplayers issue with bluefireteam/audioplayers#344 (comment)

79cacdd

mustafabhatkar mentioned this issue Sep 21, 2020

Upgrading to 0.16.0 crashes on iOS #613

Closed

erickzanardo closed this as completed Apr 10, 2021

flutter: Fatal Error: Callback lookup failed! #344

flutter: Fatal Error: Callback lookup failed! #344

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