'Flutter facebook app events : lateinit property anonymousId has not been initialized

I'm trying to call Facebook app events in my flutter project. I'm using the dependency facebook_app_events: ^0.12.0. meta-data is also added in the manifest file.

    <meta-data
        android:name="com.facebook.sdk.ApplicationId"
        android:value="@string/facebook_app_id" />


void callFBEvent() async {
    try {
      var i = await facebookAppEvents.getAnonymousId();
      await facebookAppEvents.setAdvertiserTracking(enabled: true);
      await facebookAppEvents.logEvent(
          name: "User_Selection_Screen", parameters: {
        "User_Selection": "User_Selection",
      });
      print("facebook event success User_Selection_Screen");
    }catch(e){
      print(e);
    }
  }

Getting below error

kotlin.UninitializedPropertyAccessException: lateinit property anonymousId has not been initialized
    at id.oddbit.flutter.facebook_app_events.FacebookAppEventsPlugin.handleGetAnonymousId(FacebookAppEventsPlugin.kt:82)
    at id.oddbit.flutter.facebook_app_events.FacebookAppEventsPlugin.onMethodCall(FacebookAppEventsPlugin.kt:55)
    at io.flutter.plugin.common.MethodChannel$IncomingMethodCallHandler.onMessage(MethodChannel.java:233)
    at io.flutter.embedding.engine.dart.DartMessenger.handleMessageFromDart(DartMessenger.java:84)
    at io.flutter.embedding.engine.FlutterJNI.handlePlatformMessage(FlutterJNI.java:822)
    at android.os.MessageQueue.nativePollOnce(Native Method)
    at android.os.MessageQueue.next(MessageQueue.java:336)
    at android.os.Looper.loop(Looper.java:174)
    at android.app.ActivityThread.main(ActivityThread.java:7386)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:980)

Solution 1:^[1]

I open the project in an android module. Then just clean the build of the project first and then just build and sync the Gradle in the android module. then the issue was solved. But I already use pub get lots of time before that but that didn't work. fine, my issue was solved.

Solution 2:^[2]

In my case the problem was that I inserted the the meta data under actvity tag instead of inserting that under application tag

        <meta-data android:name="com.facebook.sdk.ApplicationId" android:value="@string/facebook_app_id"/>

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution	Source
Solution 1	Ankur Shinde
Solution 2	Ron Badur

'Flutter facebook app events : lateinit property anonymousId has not been initialized

Solution 1:[1]

Solution 2:[2]

Sources

Related Questions

Solution 1:^[1]

Solution 2:^[2]