When trying to run a transaction in live mode, it takes the card number, and
when you click next, it returns this error:

"A required parameter was missing"

I searched the lang files for the modules, and this error message is being
generated by the Orders module from this line:
echo $this->DisplayErrorMessage($this->Lang('error_insufficientparams'));

The problem is, this error message is used in about 15 different places in the
Orders module, so I cannot figure out exactly where it is coming from or which
parameter is missing.

Versions:

CMSMS 1.6.6
Orders 1.6.1
AuthNetAim 1.0.2
CGPaymentGatewayBase 1.03