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java.lang.NullPointerException: 	at com.example.gravitas2015.MainActivity$jsonhandler.handleResponse(MainActivity.java:284)	at com.example.gravitas2015.MainActivity$jsonhandler.handleResponse(MainActivity.java:1)	at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:657)	at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:627)	at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:616)	at android.net.http.AndroidHttpClient.execute(AndroidHttpClient.java:273)	at com.example.gravitas2015.MainActivity$request.doInBackground(MainActivity.java:250)	at com.example.gravitas2015.MainActivity$request.doInBackground(MainActivity.java:1)	at android.os.AsyncTask$2.call(AsyncTask.java:288)	at java.util.concurrent.FutureTask.run(FutureTask.java:237)	at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)	at java.lang.Thread.run(Thread.java:841)