I had this problem after upgrading from 9.10 and trying to add Facebook. In my case I clicked on sign up by mistake instead of login in with my current account. I cancelled to start again and login with my Facebook account when this error appeared.
I had this problem after upgrading from 9.10 and trying to add Facebook. In my case I clicked on sign up by mistake instead of login in with my current account. I cancelled to start again and login with my Facebook account when this error appeared.