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Attempt to invoke virtual method 'void android.widget.ListView.setAdapter(android.widget.ListAdapter)' on a null object reference
java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ListView.setAdapter(android.widget.ListAdapter)' on a null object reference	at vss.testvss.MainActivity$JSONTask.onPostExecute(MainActivity.java:159)	at vss.testvss.MainActivity$JSONTask.onPostExecute(MainActivity.java:88)	at android.os.AsyncTask.finish(AsyncTask.java:660)