Make sure you enter the correct email and password combination. If you are entering it wrong, you will receive the following error. If you have forgotten your password, you can set a new password for your account by clicking 'Forgot Password'.
Make sure you are logged in to English Ninjas Kids web site (www.kids.englishninjas.com) via your computer or English Ninjas Kids application installed on your iPad.
If the problem persists, you can report the issue to the Live Support team for more detailed information.