Fatal error: Uncaught Error: Class "Symfony\Contracts\EventDispatcher\Event" not found in /home/exklusivbeautysa/public_html/vendor/contao/newsletter-bundle/src/Event/SendNewsletterEvent.php:17 Stack trace: #0 {main} thrown in /home/exklusivbeautysa/public_html/vendor/contao/newsletter-bundle/src/Event/SendNewsletterEvent.php on line 17