Fatal error: Uncaught Error: Class "Symfony\Component\EventDispatcher\Event" not found in /home/yrdsb11w3creativ/public_html/yrdsb/vendor/symfony/http-kernel/Event/KernelEvent.php:23 Stack trace: #0 {main} thrown in /home/yrdsb11w3creativ/public_html/yrdsb/vendor/symfony/http-kernel/Event/KernelEvent.php on line 23