problem "pause" DOWNLOADING

[ye4ever]

hi

when stop download and try pause download

03-02 17:50:55.605: W/dalvikvm(1186): threadid=1: thread exiting with uncaught exception (group=0x40a71930)
03-02 17:50:55.716: E/AndroidRuntime(1186): FATAL EXCEPTION: main
03-02 17:50:55.716: E/AndroidRuntime(1186): java.lang.NullPointerException
03-02 17:50:55.716: E/AndroidRuntime(1186): at es.jimy12.jaudioplayer.PlayerActivity.playSong(PlayerActivity.java:470)
03-02 17:50:55.716: E/AndroidRuntime(1186): at es.jimy12.jaudioplayer.PlayerActivity$DownloadAsyncTask.onPostExecute(PlayerActivity.java:621)
03-02 17:50:55.716: E/AndroidRuntime(1186): at es.jimy12.jaudioplayer.PlayerActivity$DownloadAsyncTask.onPostExecute(PlayerActivity.java:1)
03-02 17:50:55.716: E/AndroidRuntime(1186): at android.os.AsyncTask.finish(AsyncTask.java:631)
03-02 17:50:55.716: E/AndroidRuntime(1186): at android.os.AsyncTask.access$600(AsyncTask.java:177)
03-02 17:50:55.716: E/AndroidRuntime(1186): at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:644)
03-02 17:50:55.716: E/AndroidRuntime(1186): at android.os.Handler.dispatchMessage(Handler.java:99)
03-02 17:50:55.716: E/AndroidRuntime(1186): at android.os.Looper.loop(Looper.java:137)
03-02 17:50:55.716: E/AndroidRuntime(1186): at android.app.ActivityThread.main(ActivityThread.java:5041)
03-02 17:50:55.716: E/AndroidRuntime(1186): at java.lang.reflect.Method.invokeNative(Native Method)
03-02 17:50:55.716: E/AndroidRuntime(1186): at java.lang.reflect.Method.invoke(Method.java:511)
03-02 17:50:55.716: E/AndroidRuntime(1186): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
03-02 17:50:55.716: E/AndroidRuntime(1186): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)

03-02 17:50:55.716: E/AndroidRuntime(1186): at dalvik.system.NativeStart.main(Native Method)