Fatal error: Uncaught Error: Class 'Symfony\Component\EventDispatcher\GenericEvent' not found in /var/www/html/navirre.com/htdocs/concrete/src/Page/Sitemap/Event/XmlReadyEvent.php:8 Stack trace: #0 {main} thrown in /var/www/html/navirre.com/htdocs/concrete/src/Page/Sitemap/Event/XmlReadyEvent.php on line 8