Fatal error: Uncaught Error: Class "Symfony\Contracts\EventDispatcher\Event" not found in /home/ldt/public_html/canvas/udoit/vendor/symfony/mailer/Event/MessageEvent.php:23 Stack trace: #0 {main} thrown in /home/ldt/public_html/canvas/udoit/vendor/symfony/mailer/Event/MessageEvent.php on line 23