I use fasebook login button in my app code. After I logged in at Facebook App, logging it in at My app is success. But When I am not logged in at Facebook App, I logged in it at My App,next I went to the Facebook App, next I put my account in Facebook. After successfully logging it in at Facebook App, I go back to my App. And Error happen including NullPointerException that is not finding Profile. Former situation is successfully finding Profile. But Latter situation is not finding Profile. Why?
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