Getting the same thing now. Was fine this evening for three hours. I was in shade form on my necro and used my personnal bind stone. I popped up at my bind, Gothwaite, and i was in shade form still and no pet. I figured it would clear once I zoned. So i went to the teleporter and tried to port to Camelot. I got the splash screen unable to connect, hit Esc. So I relaunched the game, got to chr select and tried to log in my necro. It just loops back to chr select instead of entering the game. So i tried to restart again and got the same error as you when i launched the phoenix launcher. Since then I have tried to log in other chrs and get the same thing.
Try logging in with your email instead of your username. If this does not work, try to reset your password to something with a different combination of special characters. If the password change works, I'm interested in what special characters your current password had.