Umm, whoops. Attacking should work now. And try resetting now if you can't get past the reset page due to the "can't reset again" error.
Invalid User ID
The user ID you entered is either an inactive user account or does not exist. User accounts can be inactive due to entering vacation mode, not logging in for 2 weeks, deleting, being banned, or not having been reactivated yet in the current age of the game.