[Plugin: LeagueManager] The plugin is not working

Hi, i have this php error every option of the configuration panel:

Warning: call_user_func(leaguemanager_upgrade_false) [function.call-user-func]: First argument is expected to be a valid callback in /home/website/public_html/wp-content/plugins/leaguemanager/admin/admin.php on line 115

i can’t use the plugin V_V.

I’m usign the development version of wordpress 3.0.1.x (trac.wordpress.com).