It is looks crazy but it work
Really issue because of you privite facebook account got this app and hash key of this account does't comparable
But you musn't to faced this error with real user. But I am not sure
Eventually follow next step :
And then click cross
And now you can login with facebook. But next time if you log out and than will try log in again you faced with the same issue...
It is also weird...
But I don't bellieve that facebook don't know about this ...