java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at org.json.JSONTokener.nextCleanInternal(JSONTokener.java:116)
at org.json.JSONTokener.nextValue(JSONTokener.java:94)
at org.json.JSONObject.(JSONObject.java:154)
at org.json.JSONObject.(JSONObject.java:171)
at com.dl.domo.arduino.showList(arduino.java:342)
at com.dl.domo.arduino$1LoginAsync.onPostExecute(arduino.java:411)
at com.dl.domo.arduino$1LoginAsync.onPostExecute(arduino.java:370)
at android.os.AsyncTask.finish(AsyncTask.java:631)
at android.os.AsyncTask.access$600(AsyncTask.java:177)
at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:644)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:176)
at android.app.ActivityThread.main(ActivityThread.java:5319)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1102)

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