PHP Template Error

Theme: New (Light)
Error: Warning: fetch_template() calls should be replaced by the vB_Template class. Template name: advertisement_footer in [path]/includes/functions.php on line 4316
Note: This error message is at the top of every page I load.
Effect:

———- Post added at 07:13 PM ———- Previous post was at 07:12 PM ———-

When making this post, it posted correctly, HOWEVER when the forum tried to redirect me I recieved THESE error messages

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]/vbseo/includes/functions_vbseo_url.php on line 549

Warning: Cannot modify header information – headers already sent by (output started at [path]/includes/class_core.php:5588) in [path]/vbseo/includes/functions_vbseo_url.php on line 553