need ASAP help with oscommerce2

We recently upgraded an older version of oscommerce to oscommerce 2.2 RC2 and we are getting errors when a transaction is submitted for processing: Warning: Cannot modify header information - headers already sent by (output started at /home/content/w/i/n/html/shop/includes/modules/payment/[login to view URL]) in /home/content/w/i/n//html/shop/includes/functions/[login to view URL] on line 33 In the old version we were using a curl path and we don't have anywhere to enter this information in the new version. Additionally, the credit card option we are using is wanting a proxy server and godaddy doesn't use a proxy. We really need to get this working ASAP and would like to chat online while you can fix this. your help is appreciated. thank you.