error message

I went to purge the system of posers who have not met the deadline to have the requirements fulfilled....after I pm'd them all, I hit "select all" and hit "deny", I got the following message:

Fatal error: Call to a member function set_existing() on a non-object in /home/trailvoy/domains/forums.trailvoy.com/public_html/group.php on line 3999

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interesting?:undecided