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Attempt to invoke virtual method 'android.view.View android.view.ViewGroup.findViewById(int)' on a null object reference
java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.View android.view.ViewGroup.findViewById(int)' on a null object reference	at org.wordpress.android.ui.people.PeopleInviteFragment.styleButton(PeopleInviteFragment.java:354)	at org.wordpress.android.ui.people.PeopleInviteFragment.access$800(PeopleInviteFragment.java:38)	at org.wordpress.android.ui.people.PeopleInviteFragment$8.onUsernameValidation(PeopleInviteFragment.java:321)	at org.wordpress.android.ui.people.utils.PeopleUtils$11.onResponse(PeopleUtils.java:289)	at org.wordpress.android.ui.people.utils.PeopleUtils$11.onResponse(PeopleUtils.java:267)	at com.wordpress.rest.RestRequest.deliverResponse(RestRequest.java:76)	at com.wordpress.rest.RestRequest.deliverResponse(RestRequest.java:19)	at com.android.volley.ExecutorDelivery$ResponseDeliveryRunnable.run(ExecutorDelivery.java:99)	at android.os.Handler.handleCallback(Handler.java:739)	at android.os.Handler.dispatchMessage(Handler.java:95)	at android.os.Looper.loop(Looper.java:135)	at android.app.ActivityThread.main(ActivityThread.java:5221)	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:899)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)