Fatal error: Uncaught Error: Class "Symfony\Contracts\EventDispatcher\Event" not found in /home/iotechtniu/ioacademy/vendor/symfony/security-http/Event/DeauthenticatedEvent.php:28 Stack trace: #0 {main} thrown in /home/iotechtniu/ioacademy/vendor/symfony/security-http/Event/DeauthenticatedEvent.php on line 28