Hello all just wondering what all these are about

Warning: fetch_template() calls should be replaced by the vB_Template class. Template name: advertisement_footer in [path]/includes/functions.php on line 4316

Warning: Cannot modify header information - headers already sent by (output started at [path]/includes/class_core.php:5588) in [path]/includes/functions.php on line 4100

You should post bugs in this (Thread 92783) already-existing thread. :)