I've been gone a while, I came back, and now whenever I click index links it's not taking me to the posts. Instead I get a page with two lines and nothing more. This is what it says:

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