If you're getting this message it means that our system was not able to communicate with the system of the payment provider you've selected. This is not a problem from your side, so feel free to try again.
If you see this message several times, it's possible that the payment provider you're trying to use is currently unavailable or down for maintenance. In which case, we would recommend that you try again at a later time.
If the problem persists, please contact our support team by creating a ticket here.