Magento *Card type doesn't match credit card number* error

In Progress Posted Jan 6, 2011 Paid on delivery
In Progress Paid on delivery

I'm trying to process credit cards on my Magento account but my visa returns this error

*Card type doesn't match credit card number*

The website is [url removed, login to view]

eCommerce Magento PHP Script Install

Project ID: #905000

About the project

Remote project Active Jan 12, 2011