users.Report: java.lang.UnsupportedOperationException: JsonNull

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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.ion.IonRequestBuilder$1.run(IonRequestBuilder.java:242)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:212)
at android.app.ActivityThread.main(ActivityThread.java:5135)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:877)

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