This is the problem that i have.
I use those two plugins:
WP Super Cache & Disable Canonical URL Redirection
now with both plugins on, main site is ok but when i click on category,archive or whatever i see this error:
Warning: Cannot modify header information - headers already sent by (output started at /home/sites/guistyles.com/public_html/wp-content/plugins/disable-canonical-redirects.php:12) in /home/sites/guistyles.com/public_html/wp-content/plugins/wp-super-cache/wp-cache-phase2.php on line 79
When i disable wp super cache everything is working good.
Please help to solve this one out.