Fatal error: Uncaught Error: Class "Symfony\Component\EventDispatcher\GenericEvent" not found in /srv/disk3/2724534/www/transdoetaskforce.org/concrete/src/Page/Sitemap/Event/XmlReadyEvent.php:8 Stack trace: #0 {main} thrown in /srv/disk3/2724534/www/transdoetaskforce.org/concrete/src/Page/Sitemap/Event/XmlReadyEvent.php on line 8