java.lang.NullPointerException at com.baidu.voicerecognition.android.w$1.onCompletion(w.java) at android.media.MediaPlayer$EventHandler.handleMessage(MediaPlayer.java:2383) at android.os.Handler.dispatchMessage(Handler.java:110) at android.os.Looper.loop(Looper.java:193) at android.app.ActivityThread.main(ActivityThread.java:5468) at java.lang.reflect.Method.invokeNative(Method.java) at java.lang.reflect.Method.invoke(Method.java:515) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:676)

at dalvik.system.NativeStart.main(NativeStart.java)

在友盟上反馈的错误日志，请问是怎么引起的？希望告知