[seyfin]

Such kind of error might be caused by the fact that some files/data in your X-Cart store have not been upgraded properly. As a possible solution, try to remove the module completely, then install it again.

However, if the error still persists, I would suggest to file a support ticket in your personal Helpdesk area, to have our support engineers investigate the issue right in your X-Cart installation, in order to find out the actual cause of the problem and proper solution.

Thank you.

P.S. I would recommend you to change the signature from "Ver 5.1.11" to "Ver 5.2.6", since your X-Cart store has been upgraded recently.