I read the sticky regarding this error, and wasn't sure where to post, so hopefully, this won't fall on deaf ears.

I received this error message after the latest Wizard hotfix. I checked the Secondary Logon, and it was not set to Automatic.

I really didn't want to go through the hassle of unistalling, so, instead, I simply inserted my game disk. It then proceeded to update the update agent, launcher, etc., and after it finished, I was then able to log into the game.