Fatal error: Call to undefined function:

[phixon]

I have just clean installed OSC, and installed the latest QT Pro. When i go to /admin/categories.php?selected_box=catalog# I get the following error

 

Fatal error: Call to undefined function: tep_hide_session_id() in /home/sites/MYDOMAIN!!!.com/public_html/shopping/admin/categories.php on line 746

 

The header and nav bar on the left are all there, but the body area on the right just says that.