"You are already logged in on this computer" "..No I'm not."

I’m trying to log in after doing updates, but keep getting the error that I’m “already logged into this computer” or something along those lines.

I’ve reset the computer, reinstalled PMU. Y U NO WORK?!
D’:

Lol, I do not know the cause to this, but it happens to me from time to time as well. It should be fixed in a lil bit.

If you cant wait, usually when I re-start my computer it gets fixed~