This means there has been an issue with the payment on file being declined. This is normally because you have received a new credit/debit card than what is on file, or you need to update the expiration date.
This is easy to fix: Go to Instantink.com and click the link to Sign In, which is located at the top right of the page, or under the 3 horizontal lines if you are on a mobile device. On your account home page, click “Change Billing Information”, then “Change Payment Method”. Re-enter all the data (credit card number, expiration date and CVV) even if you are only updating the expiration. After you save your changes, it may take a few hours to re-process the payment card. When the card has been re-processed, you will be able to print again.