I downloaded new AndroidSDK and updated to B4A 10.90
I created a new b4a project for testing and added Exoplayer Library 1.50. and in Layout designer I added SimpleExoPlayerView and generated member in Sub Globals.
B4A Code:
Private SimpleExoPlayerView1 As SimpleExoPlayerView
I reinstalled B4A, Additional LIB, New Android SDK downloaded using B4A SDKManager and I tried both the settings "C:\Android\platforms\android-30\android.jar " and " C:\Android\platforms\android-28\android.jar ". But not successful.