I have a number of VQMods in place, and realize it could be one of those causing the issue, but some help in understanding what to look for would be gratefully received

Notice: Undefined variable: order_id in /home/users/html/twperformanceparts.com/catalog/controller/account/order.php on line 110Warning: Cannot modify header information - headers already sent by (output started at /home/users/html/twperformanceparts.com/index.php:104) in /home/users/html/twperformanceparts.com/vqmod/vqcache/vq2-system_engine_controller.php on line 28Warning: Cannot modify header information - headers already sent by (output started at /home/users/html/twperformanceparts.com/index.php:104) in /home/users/html/twperformanceparts.com/vqmod/vqcache/vq2-system_engine_controller.php on line 29