Fatal error: Uncaught Error: Class "Symfony\Component\Validator\Constraint" not found in /home/ldt/public_html/canvas/udoit/vendor/symfony/form/Extension/Validator/Constraints/Form.php:19 Stack trace: #0 {main} thrown in /home/ldt/public_html/canvas/udoit/vendor/symfony/form/Extension/Validator/Constraints/Form.php on line 19