Can't anyone help a gal out?

hehe jk
In thinking about this (whilst banging my head upon my desk all weekend), I'm wondering if my problem is because I have other hacks installed, or if I made a silly mistake somewhere and I'm just not seeing it.
To be a little more specific about when we get the error on our boards, members can't view profiles without getting the script error:
Quote:
Fatal error: Call to undefined function: convert_ids_to_titles() in /****/****/****/****/includes/functions_online.php on line 33
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Also, when attempting to view Currently Active Users, we get:
Quote:
Fatal error: Call to undefined function: sanitize_perpage() in /****/****/****/****/forums/online.php on line 77
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Any ideas on what I need to do so this awesome hack will work for us? It's EXACTLY what we've been looking for.

Do I need to go in and tweak something or rerun the install?