Warning: require_once(extranet/sitemap.xml.php): failed to open stream: No such file or directory in C:\xampp\htdocs\index.php on line 12

Fatal error: require_once(): Failed opening required 'extranet/sitemap.xml.php' (include_path='C:\xampp\php\PEAR') in C:\xampp\htdocs\index.php on line 12