Auto-Billing Not Working Properly

We have recently started using payment plans to help constituents pay for our week long theater camps. Now we want to start using auto-billing on those payment plans. When I run the Ticket Order Billing utility, however, it is not charging the credit card because it is telling that there  "***No Account Number Available." A credit card has been entered in the set up of the payment plan and the Billing Type is designated as Auto CC Billing in the system table. Does anyone know why this might be happening? Am I a missing a step somewhere? Thank you.

Joseph Yoga