Fatal error: Uncaught Error: Class "Symfony\Contracts\EventDispatcher\Event" not found in /home/ldt/public_html/canvas/udoit/vendor/symfony/security-core/Event/AuthenticationEvent.php:22 Stack trace: #0 {main} thrown in /home/ldt/public_html/canvas/udoit/vendor/symfony/security-core/Event/AuthenticationEvent.php on line 22