Error: Warning: all_user_func

Please help. I’m getting the following error in one of the IDX plugins:

“Warning: all_user_func(flexmlsConnectSettings::settings_overview_linking) [function.call-user-func]: First argument is expected to be a valid callback in /home/crysta37/public_html/CarteretCountyForeclosures.com/wp-admin/includes/template.php on line 1102”

WP version 3.3.1

Thanks in advance!