报个错 ..call_user_func() expects parameter

http://wp.me/wp-admin/themes.php?page=wpjam-theme-support

Warning: call_user_func() expects parameter 1 to be a valid callback, function 'wpjam_theme_support_page' not found or invalid function name in D:\phpStudy\PHPTutorial\WWW\wp\wp-content\plugins\wpjam-basic\php5\include\admin\admin-menus.php on line 188