Fatal error: Uncaught Error: Class 'DOMDocument' not found in /var/www/html/controller/sitemap.xml.php:84 Stack trace: #0 /var/www/html/include/main.php(504): include_once() #1 /var/www/html/index.php(4): MTsung\main->loadController() #2 {main} thrown in /var/www/html/controller/sitemap.xml.php on line 84