This message means that you have exceeded the maximum number of failed attempts to check your details, either when registering your card for the first time, when you've entered the wrong password too many times or you just wanted to change your password. This is done to make it harder for somebody other than you to use the account.
If this happens, please contact us on 0845 766 5522 so we can help. You will not be able to complete your purchase or use your card for subsequent online purchases at registered VbV retailers until you have contacted us.