Forum Call to undefined function fetch_seo_thread() on line 636
 

Hello:

When I try to read the RSS1 feed of my forum I get the following error:

Fatal error: Call to undefined function fetch_seo_thread() in /path/changed/public_html/external.php on line 636

It seems something was forgotten. Even on this forum I can't retrieve the RSS1 feed:
http://www.vbulletin.com/forum/external.php?type=RSS1