java.lang.IllegalArgumentException: View=DecorView@d90c255[FaceTrackerActivity] not attached to window manager
	at android.view.WindowManagerGlobal.findViewLocked(WindowManagerGlobal.java:534)
	at android.view.WindowManagerGlobal.removeView(WindowManagerGlobal.java:438)
	at android.view.WindowManagerImpl.removeViewImmediate(WindowManagerImpl.java:162)
	at android.app.Dialog.dismissDialog(Dialog.java:392)
	at android.app.Dialog.dismiss(Dialog.java:374)
	at d4.y$f.f1(Unknown Source:5)
	at d4.y$f.onPostExecute(Unknown Source:2)
	at android.os.AsyncTask.finish(AsyncTask.java:771)
	at android.os.AsyncTask.access$900(AsyncTask.java:199)
	at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:788)
	at android.os.Handler.dispatchMessage(Handler.java:106)
	at android.os.Looper.loopOnce(Looper.java:201)
	at android.os.Looper.loop(Looper.java:288)
	at android.app.ActivityThread.main(ActivityThread.java:7886)
	at java.lang.reflect.Method.invoke(Native Method)
	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:568)
	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1045)