code run on ginger bread but not working on Jelly Bean?

code run on ginger bread but not working on Jelly Bean?

I am doing DOM xml parsing,My code is working perfectly on Ginger bread
while not working on Jelly Bean. showing NullPointerException . on below
line got error.
NodeList n1= doc.getElementsByTagName("dua_detail");
I took xml File from assets folder perfectly on AsyncTask.
08-29 18:01:23.785: E/AndroidRuntime(3575): java.lang.NullPointerException
08-29 18:01:23.785: E/AndroidRuntime(3575): at
com.example.zad_e_rah.Finalview.pinpointxml(Finalview.java:67)
08-29 18:01:23.785: E/AndroidRuntime(3575): at
com.example.zad_e_rah.Finalview$GetAudiojokefromserver.onPostExecute(Finalview.java:333)
08-29 18:01:23.785: E/AndroidRuntime(3575): at
com.example.zad_e_rah.Finalview$GetAudiojokefromserver.onPostExecute(Finalview.java:1)
08-29 18:01:23.785: E/AndroidRuntime(3575): at
android.os.AsyncTask.finish(AsyncTask.java:631)
08-29 18:01:23.785: E/AndroidRuntime(3575): at
android.os.AsyncTask.access$600(AsyncTask.java:177)
08-29 18:01:23.785: E/AndroidRuntime(3575): at
android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:644)
08-29 18:01:23.785: E/AndroidRuntime(3575): at
android.os.Handler.dispatchMessage(Handler.java:99)
08-29 18:01:23.785: E/AndroidRuntime(3575): at
android.os.Looper.loop(Looper.java:153)
08-29 18:01:23.785: E/AndroidRuntime(3575): at
android.app.ActivityThread.main(ActivityThread.java:5086)
08-29 18:01:23.785: E/AndroidRuntime(3575): at
java.lang.reflect.Method.invokeNative(Native Method)
08-29 18:01:23.785: E/AndroidRuntime(3575): at
java.lang.reflect.Method.invoke(Method.java:511)
08-29 18:01:23.785: E/AndroidRuntime(3575): at
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:821)