We have encountered some users experiencing this message.
If this happens to you, here are the steps to resolve.
If you are NOT logged into your account:
If you ARE logged into your account:
Next to all of your saved addresses, click the DELETE button
Once you have deleted all of your saved addresses, log out of the website
Sign in to your account
Head back into the checkout, this time you will need to type out your address in full. Hopefully this should solve the issue.
If the steps above don't solve the issue, please click here to contact us so that we can provide further assistance