Fatal error: Uncaught Error: Class "Symfony\Contracts\EventDispatcher\Event" not found in D:\xampp\htdocs\pimcore\my-project\vendor\presta\sitemap-bundle\src\Event\SitemapAddUrlEvent.php:28 Stack trace: #0 {main} thrown in D:\xampp\htdocs\pimcore\my-project\vendor\presta\sitemap-bundle\src\Event\SitemapAddUrlEvent.php on line 28