java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String com.google.gson.JsonObject.toString()' on a null object reference

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Attempt to invoke virtual method 'java.lang.String com.google.gson.JsonObject.toString()' on a null object reference
java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String com.google.gson.JsonObject.toString()' on a null object reference
at campus.app.com.newline.campusmobapp.StudentsProfile$1.onCompleted(StudentsProfile.java:58)
at campus.app.com.newline.campusmobapp.StudentsProfile$1.onCompleted(StudentsProfile.java:51)
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$1.run(IonRequestBuilder.java:244)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:211)
at android.app.ActivityThread.main(ActivityThread.java:5389)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1020)

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