Fatal error: Uncaught Error: Interface "Symfony\Contracts\Service\ServiceSubscriberInterface" not found in /home/ldt/public_html/canvas/udoit/vendor/symfony/framework-bundle/Controller/AbstractController.php:53 Stack trace: #0 {main} thrown in /home/ldt/public_html/canvas/udoit/vendor/symfony/framework-bundle/Controller/AbstractController.php on line 53