Fatal error: Uncaught Error: Class 'DOMDocument' not found in /var/www/html/phpservermon/vendor/symfony/config/Util/XmlUtils.php:52 Stack trace: #0 /var/www/html/phpservermon/vendor/symfony/dependency-injection/Loader/XmlFileLoader.php(280): SymfonyComponentConfigUtilXmlUtils::loadFile('/var/www/html/p...', Array) #1 /var/www/html/phpservermon/vendor/symfony/dependency-injection/Loader/XmlFileLoader.php(41): SymfonyComponentDependencyInjectionLoaderXmlFileLoader->parseFileToDOM('/var/www/html/p...') #2 /var/www/html/phpservermon/src/psm/Router.php(201): SymfonyComponentDependencyInjectionLoaderXmlFileLoader->load('services.xml') #3 /var/www/html/phpservermon/src/psm/Router.php(54): psmRouter->buildServiceContainer() #4 /var/www/html/phpservermon/src/bootstrap.php(66): psmRouter->__construct() #5 /var/www/html/phpservermon/index.php(28): require('/var/www/html/p...') #6 {main} thrown in /var/www/html/phpservermon/vendor/symfony/config/Util/XmlUtils.php on line 52