Class Not Registered error displayed during credit card processing

Atrex > Error Messages
The "Class Not Registered" error message displayed during credit card processing indicates that a required component of the Worldpay / Vantiv plug-in has been uninstalled.  

To resolve this issue, re-install the Worldpay / Vantiv plug-in available for downloaded from the Millennium Software Client Center.

Please note that Atrex 22 and newer include all of the payment plugins as part of the standard installation.

Article ID: 83, , Modified: 10/13/2026 at 1:49 PM

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