PHP User Warning

Whenever I reply to a thread I'm getting this error message:
Attachment 168387

My reply still shows up in the thread just fine, but I still see those messages which reads:
PHP User Warning: fetch_template() calls should be replaced by the vB_Template class. Template name: bbcode_highlight in ..../includes/functions.php on line 4197

Thank you. It's a known issue that has already been discussed.