X-Cart forums - X-Payments Internal Error: Data validation error

I am trying to test my X-Payments module however when I hit the submit button on the X-Payments page I get an Internal Error. This error shows in the X-Payments domain, not a redirect back to our eCommerce domain.

The error log prints:

ERROR [2012-28-06 12:01:38]
User: unknown; IP: xxx.xxx.xxx.xxx
Zone: VSNode
Code: NOT_A_NUMERIC (1510)
Data validation error, node "VISACARDLEVEL": Not numeric (value: 'G ')

Affected systems: VSNode/Base/Node.php file (124:assert); VSNode/Float.php file (119:assert); VSNode/Integer.php file (75:validate); VSNode$

However the payment shows authorized in our paypal manager, but X-Cart and X-Payments show the order as failed. We have yet to successfully complete any test transaction in this manner though the test module button in the X-Cart configuration is always successful.

We are using X-Payments version 1.0.4 and the payflow pro gateway. Our gateway credentials are accurate and everything up to this point has worked just fine.

Thanks