java.lang.IllegalStateException: Exception thrown on Scheduler.Worker thread. Add `onError` handling.

[y2k]

java.lang.IllegalStateException: Exception thrown on Scheduler.Worker thread. Add `onError` handling.
    at rx.internal.schedulers.ScheduledAction.run(ScheduledAction.java:60)
    at rx.internal.schedulers.ExecutorScheduler$ExecutorSchedulerWorker.run(ExecutorScheduler.java:104)
    at android.os.Handler.handleCallback(Handler.java:739)
    at android.os.Handler.dispatchMessage(Handler.java:95)
    at android.os.Looper.loop(Looper.java:148)
    at android.app.ActivityThread.main(ActivityThread.java:5525)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:730)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:620)
Caused by: rx.exceptions.OnErrorNotImplementedException: Prepare failed.: status=0x1
    at rx.internal.util.InternalObservableUtils$ErrorNotImplementedAction.call(InternalObservableUtils.java:386)
    at rx.internal.util.InternalObservableUtils$ErrorNotImplementedAction.call(InternalObservableUtils.java:383)
    at rx.internal.util.ActionSubscriber.onError(ActionSubscriber.java:44)
    at rx.observers.SafeSubscriber._onError(SafeSubscriber.java:157)
    at rx.observers.SafeSubscriber.onError(SafeSubscriber.java:120)
    at rx.exceptions.Exceptions.throwOrReport(Exceptions.java:204)
    at rx.observers.SafeSubscriber.onNext(SafeSubscriber.java:144)
    at rx.subjects.SubjectSubscriptionManager$SubjectObserver.onNext(SubjectSubscriptionManager.java:225)
    at rx.subjects.PublishSubject.onNext(PublishSubject.java:114)
    at y2k.joyreactor.common.ObservableProperty$$special$$inlined$observable$1.afterChange(Delegates.kt:57)
    at kotlin.properties.ObservableProperty.setValue(ObservableProperty.kt:36)
    at y2k.joyreactor.common.ObservableProperty.setValue(ObservableProperty.kt)
    at y2k.joyreactor.common.ObservableProperty.plusAssign(ObservableProperty.kt:24)
    at y2k.joyreactor.viewmodel.VideoViewModel$1.invoke(VideoViewModel.kt:24)
    at y2k.joyreactor.viewmodel.VideoViewModel$1.invoke(VideoViewModel.kt:12)
    at y2k.joyreactor.common.ObservableExtensionsKt$sam$Action1$0605da30.call(ObservableExtensions.kt)
    at rx.Single$16.onNext(Single.java:1687)
    at rx.observers.SafeSubscriber.onNext(SafeSubscriber.java:139)
    at rx.internal.operators.OperatorObserveOn$ObserveOnSubscriber.call(OperatorObserveOn.java:227)
    at rx.internal.schedulers.ScheduledAction.run(ScheduledAction.java:55)
    ... 8 more
Caused by: java.io.IOException: Prepare failed.: status=0x1
    at android.media.MediaPlayer._prepare(Native Method)
    at android.media.MediaPlayer.prepare(MediaPlayer.java:1163)
    at y2k.joyreactor.widget.MuteVideoView.play(MuteVideoView.kt:54)
    at y2k.joyreactor.common.BindingBuilder$muteVideoView$1.invoke(ViewBinding.kt:143)
    at y2k.joyreactor.common.BindingBuilder$muteVideoView$1.invoke(ViewBinding.kt:60)
    at y2k.joyreactor.common.ObservablePropertyKt$sam$Action1$fb5cd431.call(ObservableProperty.kt)
    at rx.internal.util.ActionSubscriber.onNext(ActionSubscriber.java:39)
    at rx.observers.SafeSubscriber.onNext(SafeSubscriber.java:139)
    ... 21 more