Playing video after another video on textureview

I'm trying to play a video after another video finishes playing. Keep in mind that this is TextureView NOT VideoView. The first videos shows fine, no problemo. And the setOnCompletionListener fires just fine, but when it gets to the setDataSource line, it crashes with this log:

2022-07-28 20:59:09.485 12081-12081/? E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.videobackgroundexample, PID: 12081
java.lang.IllegalStateException
    at android.media.MediaPlayer._setDataSource(Native Method)
    at android.media.MediaPlayer.setDataSource(MediaPlayer.java:1335)
    at android.media.MediaPlayer.setDataSource(MediaPlayer.java:1302)
    at com.example.videobackgroundexample.MainActivity.onSurfaceTextureAvailable$lambda-1(MainActivity.kt:71)
    at com.example.videobackgroundexample.MainActivity.$r8$lambda$52mJcje_qxHAhyGaOIjeM1Dzm4w(Unknown Source:0)
    at com.example.videobackgroundexample.MainActivity$$ExternalSyntheticLambda0.onCompletion(Unknown Source:2)
    at android.media.MediaPlayer$EventHandler.handleMessage(MediaPlayer.java:4263)
    at android.os.Handler.dispatchMessage(Handler.java:106)
    at android.os.Looper.loop(Looper.java:246)
    at android.app.ActivityThread.main(ActivityThread.java:8595)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:602)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1130)

This is my OnCompletionListener (I do have the "confetti_floor_video.mp4" file in the assets folder):

mediaPlayer!!.setOnCompletionListener {
    val fileDescriptor = assets.openFd("confetti_floor_video.mp4")
    mediaPlayer!!.setDataSource(fileDescriptor) <-- line that the crash log is complaining about.
    mediaPlayer!!.start()
}

Let me know if I need to provide more code and don't hesitate to ask questions. Thanks!

I finally fixed the issue by using this:

mediaPlayer!!.setOnCompletionListener {
    val fileDescriptor = assets.openFd("confetti_floor_video.mp4")
    mediaPlayerObj!!.reset()
    mediaPlayerObj!!.setDataSource(
        fileDescriptor!!.fileDescriptor,
        fileDescriptor!!.startOffset,
        fileDescriptor!!.length
    )
    mediaPlayerObj!!.prepareAsync()
}

Hope this helps someone else :)