I don't know if this will help, it may just have been a coincidence, but perhaps worth a try. I tried to access Best Served with Cold Steel. got the inevitable "system" message, then got this error and got kicked out of the game. Tried to get back in but got that error about 6 times on the loading screen. A friend said he would try & log in for me. He got past the loading screen and into the game, but when he tried to enter the instance he then got the error & was kicked out of the game. After that he continually got the error on the loading screen.

I then tried again to log in and I got into the game, immediately moved my character to my house and I've been fine ever since. I hadn't reported the error so I doubt I was moved by a GM & I'm terrified of trying the Quest again in case it messes up, but at least I can play.