I checked to make sure I was set to US region. I can login to the us region site but not the game. I also attempted to login to the EU region from the launcher but got the same error.
If you have a US forum and game account and want to log in to the EU game, you
must go to the EU website (
http://www.runesofmagic.com/en/home.html) to create a new forum and game account there. You should be able to use the same forum and game account name, though I've found that using a different forum name and email address works better for me. You do not have to download a separate game client--you can switch regions on your existing client installation.