FacebookCallback#onCancel() is calling after login once in Facebook Sdk 4.2.0 in Android

I have successfully implemented login with facebook in android app. But now, Amazingly, When I do login one with facebook and if I try to login with facebook using facebook library 4.2.0 its onCancel() method is calling. Help!

Solution

I solved this problem by calling: LoginManager.getInstance().logOut(); just before trying to login.