Admin Login Error

[mtnguy]

I just moved my Zen Cart to the front of our web site (index) from a sub-folder.
Al seems to be well, except when I log into the Admin area, I get an error:

Fatal error: Call to undefined function: whos_online_session_recreate() in /home/turnings/public_html/includes/functions/sessions.php on line 171

I'm not a code guru, or anything similar; could someone please shed a little light as to what is occurring?

I can get into the admin without issue after the error message by altering the url to just mysite.com/admin instead of mysite.com/admin/login.php

I would like to start re-stocking the store as soon as possible.. the error won't stop me from doing that, but I need to know that there are not some other underlying issues that need to be addressed.

Thank you for your help in advance.

Brian


Server OS: Linux 2.6.9-55.0.2.ELsmp
PHP Version: 4.4.4 (Zend: 1.3.0)
Database: MySQL 4.1.21-standard
HTTP Server: Apache/1.3.37 (Unix) mod_auth_passthrough/1.8 mod_log_bytes/1.2 mod_bwlimited/1.4 FrontPage/5.0.2.2635.SR1.2 mod_ssl/2.8.28 OpenSSL/0.9.7a PHP-CGI/0.1b