Paypal error message from the form holder when trying to check out and purchase an item via Jotform?

Hello! Can you tell me why my customer would receive a paypal error message from the form holder when trying to check out and purchase an item via Jotform?

What is the error message received? Please share a screenshot of the error message: https://www.jotform.com/help/438-How-to-Post-Screenshots-to-Our-Support-Forum