ERROR: The password field is empty on Order Acceptance

Ok I am trying to sell WordPress sites that offer the user the option to use their own domain name. I would like these sites to auto populate after using WHMCS to create and pay for their accounts.

I have downloaded WHMCS MU. When I go to accept a pending order in the admin area of WHMCS I get the following error Order Accept Encountered Problems

ERROR: The password field is empty.:

Was there a password field that I missed while setting up WHMCS MU? Anybody seen this?