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java.lang.UnsupportedOperationException: JsonNull
users.Report: java.lang.UnsupportedOperationException: JsonNull	at com.google.gson.JsonElement.getAsString(JsonElement.java:191)	at com.impact.ribony.LoginActivity$1.onCompleted(LoginActivity.java:115)	at com.impact.ribony.LoginActivity$1.onCompleted(LoginActivity.java:1)	at com.koushikdutta.async.future.SimpleFuture.handleCallbackUnlocked(SimpleFuture.java:107)	at com.koushikdutta.async.future.SimpleFuture.setComplete(SimpleFuture.java:141)	at com.koushikdutta.async.future.SimpleFuture.setComplete(SimpleFuture.java:128)	at com.koushikdutta.ion.IonRequestBuilder$1.run(IonRequestBuilder.java:242)	at com.koushikdutta.async.AsyncServer$RunnableWrapper.run(AsyncServer.java:53)	at android.os.Handler.handleCallback(Handler.java:733)	at android.os.Handler.dispatchMessage(Handler.java:95)	at android.os.Looper.loop(Looper.java:212)	at android.app.ActivityThread.main(ActivityThread.java:5135)	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:877)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:693)	at dalvik.system.NativeStart.main(Native Method)