NoSuchMethodError: No top-level getter '_firebaseMessagingBackgroundHandler' declared.

[65usami]

I am experiencing the following error and cannot resolve it.
I have followed the instructions and set the @pragma('vm:entry-point') annotation, but it results in an error.
Could anyone please help?

E/flutter (20943): [ERROR:flutter/lib/ui/dart_runtime_hooks.cc(38)] Dart Error: Unhandled exception:
E/flutter (20943): NoSuchMethodError: No top-level getter '_firebaseMessagingBackgroundHandler' declared.
E/flutter (20943): Receiver: top-level
E/flutter (20943): Tried calling: _firebaseMessagingBackgroundHandler
E/flutter (20943): #0      NoSuchMethodError._throwNew (dart:core-patch/errors_patch.dart:191)
E/flutter (20943): #1      __getCallbackFromHandle$Method$FfiNative (dart:ui)
E/flutter (20943): #2      _getCallbackFromHandle (dart:ui/natives.dart:95)
E/flutter (20943): #3      PluginUtilities.getCallbackFromHandle.<anonymous closure> (dart:ui/plugins.dart:74)
E/flutter (20943): #4      _LinkedHashMapMixin.putIfAbsent (dart:collection-patch/compact_hash.dart:543)
E/flutter (20943): #5      PluginUtilities.getCallbackFromHandle (dart:ui/plugins.dart:73)
E/flutter (20943): #6      _firebaseMessagingCallbackDispatcher.<anonymous closure> (package:firebase_messaging_platform_interface/src/method_channel/method_channel_messaging.dart:40)
E/flutter (20943): #7      MethodChannel._handleAsMethodCall (package:flutter/src/services/platform_channel.dart:571)
E/flutter (20943): #8      MethodChannel.setMethodCallHandler.<anonymous closure> (package:flutter/src/services/platform_channel.dart:564)
E/flutter (20943): #9      _DefaultBinaryMessenger.setMessageHandler.<anonymous closure> (package:flutter/src/services/binding.dart:603)
E/flutter (20943): #10     _invoke2 (dart:ui/hooks.dart:344)
E/flutter (20943): #11     _ChannelCallbackRecord.invoke (dart:ui/channel_buffers.dart:45)
E/flutter (20943): #12     _Channel.push (dart:ui/channel_buffers.dart:135)
E/flutter (20943): #13     ChannelBuffers.push (dart:ui/channel_buffers.dart:343)
E/flutter (20943): #14     PlatformDispatcher._dispatchPlatformMessage (dart:ui/platform_dispatcher.dart:737)
E/flutter (20943): #15     _dispatchPlatformMessage (dart:ui/hooks.dart:257)
E/FA      (11716): Missing google_app_id. Firebase Analytics disabled. See https://goo.gl/NAOOOI
W/FirebaseMessaging(11716): Missing Default Notification Channel metadata in AndroidManifest. Default value will be used.
I/flutter (11716): Handling a background message: 0:1715073138830399%88edccaf88edccaf
D/FLTFireMsgReceiver(11716): broadcast received for message
E/FA      (11716): Missing google_app_id. Firebase Analytics disabled. See https://goo.gl/NAOOOI

// main.dart

@pragma('vm:entry-point')
Future<void> _firebaseMessagingBackgroundHandler(RemoteMessage message) async {
  // If you're going to use other Firebase services in the background, such as Firestore,
  // make sure you call `initializeApp` before using other Firebase services.
  await Firebase.initializeApp();

  print("Handling a background message: ${message.messageId}");
}

void main() {
  FirebaseMessaging.onBackgroundMessage(_firebaseMessagingBackgroundHandler);
  runApp(MyApp());
}

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