Guild Wars 2

i have that, and still can’t log on as any chars :/

Someone has logged into my GW2 user and is playing on it all day, so i can’t do something too get him off. I can still log on my account but can’t play… when i shall log in with a char a massage comes up: another client has connected to guild wars 2 using this account. is it some way to play again or do i have to wait for an update??