I think it's a simple login or auth server issue. Especially if you can't login to the acct management or the game at the same time.
Ok, I have this error again, now. My character "freeze" when I collect daimonds pvp... ok so I do contr-shift-esc kill dcuo process ant then try login... but again error.
I was having this problem and I've had it before. I read on the internet that you can force login on PS3 by holding all four R buttons (R1, R2,R3, R4) at the same time. It workd for me when I first read it and worked again today.