Error Message on 2CO site:

Parameter Error
Incorrect parameters were supplied, therefore this purchase cannot begin.
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1) I ran the sql update through ZenCart and the table is correctly named.
2) I have a test product loaded on my site and in 2CO
3) I have the approved & pending passback urls set to http://www.{mysite.com}/catalog/process_2checkout.php
4) I have redownloaded the module and reinstalled it twice in case the files were corrupted.

Can anyone help?

RW