java.lang.NullPointerException: Attempt to get length of null array

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Attempt to get length of null array
java.lang.NullPointerException: Attempt to get length of null array	at com.example.siddhi.meavita.Activities.MainActivity.prepareData(MainActivity.java:341)	at com.example.siddhi.meavita.Activities.MainActivity.doPostExecute(MainActivity.java:370)	at com.example.siddhi.meavita.AsyncTaskClasses.GetEventsAsyncTask.onPostExecute(GetEventsAsyncTask.java:107)	at com.example.siddhi.meavita.AsyncTaskClasses.GetEventsAsyncTask.onPostExecute(GetEventsAsyncTask.java:28)	at android.os.AsyncTask.finish(AsyncTask.java:651)