I know this thread hasn't had a post since July but I encountered this problem for the first time today just about 15 mins ago. I even went to check my account to make sure nothing had been cancelled and I'm good there. I was out mining at Dragonhead and afk'd to get something to drink and came back to this error. Now I can't get back in at all. With the servers going down in less than a month I'm trying to make as much as I can of what time is left and now I can't even get in.