As reported on https://meta.wikimedia.org/wiki/User_talk:Ajraddatz#I_cant_use_my_account, Qian.Nivan.Out.Of.Service can't use his account on fawiki. The error he encountered was Error: Exception encountered, of type "Exception".
I will ask the user to upload pictures of the bug. In the mean time, the preferred solution would be the return of his ability to edit with his account. I've looked into this a bit, and it isn't being caused by AbuseFilter or any other extension that I can see. It also sounds like past issues with SUL, but I can't find related tickets after a cursory search.