Fatal error: Uncaught Error: Class 'Symfony\Contracts\EventDispatcher\Event' not found in /home/benjamincb/demos/acdg-site/vendor/symfony/security-http/Event/LogoutEvent.php:22 Stack trace: #0 {main} thrown in /home/benjamincb/demos/acdg-site/vendor/symfony/security-http/Event/LogoutEvent.php on line 22