Just was hit with this error, and can no longer login. I noticed something was up after I attempted to logout, and the game wouldn't let me. Instead, my character turned invisible and was running around without being able to use skills. While viewing things from a skewed version of 1st person view.

Also as a side note, I'm being messaged by lots of people saying that they can't login either. And are being faced with the same message. Is this linked to the PS4 outage earlier?