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:155)
at org.json.JSONObject.(JSONObject.java:172)
at com.sdpcw.imalka.loginapp.BackgroundTask.onPostExecute(BackgroundTask.java:114)
at com.sdpcw.imalka.loginapp.BackgroundTask.onPostExecute(BackgroundTask.java:29)
at android.os.AsyncTask.finish(AsyncTask.java:632)
at android.os.AsyncTask.access$600(AsyncTask.java:177)
at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:645)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5017)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)

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