It's not a Payment Error message, it's just going to the error page - http://www.warpportal.com/error.html
Trying to go to the support page from there gives me the same message
The address it's trying to go to before it redirects there says something about checkiovation.aspx, it looks like, but it's too quick to read fully or to copy&paste.
I tried to find a more general WarpPortal support forum to put this in but this was the closest thing I could find.