Warning: fetch_template() calls should be replaced by the vB_Template class
 

Does anyone know what can cause this error all of the sudden? I haven't changed anything, the forum is running 3.8.4

Code:
Warning: fetch_template() calls should be replaced by the vB_Template class. Template name: gobutton in [path]/includes/functions.php on line 3932
Warning: fetch_template() calls should be replaced by the vB_Template class. Template name: spacer_open in [path]/includes/functions.php on line 3932
Warning: fetch_template() calls should be replaced by the vB_Template class. Template name: spacer_close in [path]/includes/functions.php on line 3932
Warning: fetch_template() calls should be replaced by the vB_Template class. Template name: ad_header_logo in [path]/includes/functions.php on line 3932
Warning: fetch_template() calls should be replaced by the vB_Template class. Template name: ad_header_end in [path]/includes/functions.php on line 3932
Warning: fetch_template() calls should be replaced by the vB_Template class. Template name: ad_navbar_below in [path]/includes/functions.php on line 3932
Warning: fetch_template() calls should be replaced by the vB_Template class. Template name: ad_footer_start in [path]/includes/functions.php on line 3932
Warning: fetch_template() calls should be replaced by the vB_Template class. Template name: ad_footer_end in [path]/includes/functions.php on line 3932
Warning: fetch_template() calls should be replaced by the vB_Template class. Template name: navbar_noticebit in [path]/includes/functions.php on line 3932
Warning: fetch_template() calls should be replaced by the vB_Template class. Template name: headinclude in [path]/includes/functions.php on line 3932
Warning: fetch_template() calls should be replaced by the vB_Template class. Template name: header in [path]/includes/functions.php on line 3932
Warning: fetch_template() calls should be replaced by the vB_Template class. Template name: footer in [path]/includes/functions.php on line 3932
Warning: fetch_template() calls should be replaced by the vB_Template class. Template name: polloption in [path]/includes/functions.php on line 3932
Warning: fetch_template() calls should be replaced by the vB_Template class. Template name: polloption in [path]/includes/functions.php on line 3932
Warning: fetch_template() calls should be replaced by the vB_Template class. Template name: polloption in [path]/includes/functions.php on line 3932
Warning: fetch_template() calls should be replaced by the vB_Template class. Template name: polloption in [path]/includes/functions.php on line 3932
Warning: fetch_template() calls should be replaced by the vB_Template class. Template name: polloptions_table in [path]/includes/functions.php on line 3932