java.lang.AbstractMethodError: abstract method "void com.google.android.exoplayer2.Player$EventListener

[951AB159BA]

When i build a library with no proguard in a form of aar File and use it, then run the apk, it comes to a problem:

2020-05-09 11:32:10.026 26677-26677/com.umeye.demo E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.umeye.demo, PID: 26677
java.lang.AbstractMethodError: abstract method "void com.google.android.exoplayer2.Player$EventListener.onTimelineChanged(com.google.android.exoplayer2.Timeline, int)"
at com.google.android.exoplayer2.ExoPlayerImpl$PlaybackInfoUpdate.lambda$run$0$ExoPlayerImpl$PlaybackInfoUpdate(ExoPlayerImpl.java:804)
at com.google.android.exoplayer2.-$$Lambda$ExoPlayerImpl$PlaybackInfoUpdate$N_S5kRfhaRTAkH28P5luFgKnFjQ.invokeListener(Unknown Source:2)
at com.google.android.exoplayer2.BasePlayer$ListenerHolder.invoke(BasePlayer.java:182)
at com.google.android.exoplayer2.ExoPlayerImpl.invokeAll(ExoPlayerImpl.java:845)
at com.google.android.exoplayer2.ExoPlayerImpl.access$000(ExoPlayerImpl.java:43)
at com.google.android.exoplayer2.ExoPlayerImpl$PlaybackInfoUpdate.run(ExoPlayerImpl.java:802)
at com.google.android.exoplayer2.ExoPlayerImpl.notifyListeners(ExoPlayerImpl.java:736)
at com.google.android.exoplayer2.ExoPlayerImpl.updatePlaybackInfo(ExoPlayerImpl.java:710)
at com.google.android.exoplayer2.ExoPlayerImpl.handlePlaybackInfo(ExoPlayerImpl.java:652)
at com.google.android.exoplayer2.ExoPlayerImpl.handleEvent(ExoPlayerImpl.java:595)
at com.google.android.exoplayer2.ExoPlayerImpl$1.handleMessage(ExoPlayerImpl.java:127)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:201)
at android.app.ActivityThread.main(ActivityThread.java:6810)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:547)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:873)

I go crazy about that. Could you help me with the problem?

[951AB159BA]

Oh, I just solved it as i saw your reply to a post.
android.enableDexingArtifactTransform=false

[krocard]

Thanks for reporting how you fixed your issue.