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