Failed to see the article [ Hepl ]

[jackichan70]

when answering posts in a forum that was why the error is below. please help,

Unable to add cookies, header already sent.
File: /home1//public_html/forum/includes/class_core.php
Line: 4712

[ChopSuey]

Do you get the error using the default style?

[jackichan70]

have done, due to conflict with Mod