PHP Warning: Cannot modify header information - headers already sent by (output started at /home/mysite/public_html/system/framework.php:444) in /home/mysite/public_html/catalog/controller/startup/session.php on line 25
The most generated errors being found on Opencart forum originates from contributed programming. The increased post counters are caused by redundancies of the same solutions that were already provided prior.
File system/framework.php does not have Line 444. Someone or something must have modified it, and that modification is most likely to cause this.
Extensions for affiliates (openCart 1, 2, 3):
Advanced Multi Level Affiliate System
Customer and Affiliate Accounts Combined into one Account
Affiliate Tracking with Coupons
Discount for Referred Customers - Order Total
Type Tracking Code
Affiliate Transactions for openCart 3
Affiliate Pack X - all modules with 40% discount