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An error occured while executing doInBackground()
java.lang.NullPointerException: 	at com.amazonaws.mobile.user.IdentityManager$addUser.doInBackground(IdentityManager.java:522)	at android.os.AsyncTask$2.call(AsyncTask.java:287)	at java.util.concurrent.FutureTask.run(FutureTask.java:234)	at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)