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java.lang.NullPointerException: 	at com.example.finddoctor.BackgroundTask.onPostExecute(BackgroundTask.java:480)	at com.example.finddoctor.BackgroundTask.onPostExecute(BackgroundTask.java:24)	at android.os.AsyncTask.finish(AsyncTask.java:417)	at android.os.AsyncTask.access$300(AsyncTask.java:127)	at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:429)	at android.os.Handler.dispatchMessage(Handler.java:99)	at android.os.Looper.loop(Looper.java:123)