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An error occurred while executing doInBackground()
java.lang.NullPointerException: Attempt to invoke virtual method 'android.os.Message android.os.Handler.obtainMessage(int)' on a null object reference	at android.media.SubtitleController.selectDefaultTrack(SubtitleController.java:266)	at android.media.MediaPlayer.scanInternalSubtitleTracks(MediaPlayer.java:2310)	at android.media.MediaPlayer.prepare(MediaPlayer.java:1162)	at com.android.soundrecorder.RecorderService$3.doInBackground(RecorderService.java:775)	at com.android.soundrecorder.RecorderService$3.doInBackground(RecorderService.java:720)	at android.os.AsyncTask$2.call(AsyncTask.java:295)	at java.util.concurrent.FutureTask.run(FutureTask.java:237)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)	at java.lang.Thread.run(Thread.java:818)