Warning: require_once(//library/app/controller/Sitemap.php): failed to open stream: No such file or directory in /library/system/App.php on line 101

Fatal error: require_once(): Failed opening required '//library/app/controller/Sitemap.php' (include_path='.:/:/usr/local/php74/lib/pear') in /library/system/App.php on line 101