I couldn't find anything wrong with your .php file so I just copied it to my test area. It worked for me. Your error must be somewhere else. I have an idea. Check your usergroups. If you have uninstalled and reinstalled the hack at any time, you need to reapply permissions to which groups appear on the roster and which ones can view it.
That could be the reason why I can't even see one person on your roster. I'm not registered.
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