This may occur if your AQWorlds account name and password are entered incorrectly. If you need your account information sent to you, please go to the AQWorlds Login screen and click Forgot Password. This can also happen when you have a password with symbols, we suggest changing your password to only contain letters and numbers and after you link you can change your password again. You can always login to the AQWorlds Account Manager to verify or change your password.
You would also receive an error if you did not purchase the Ultimate DragonSlayer (or Founder package when it was available) successfully.