Fatal error: Uncaught Error: Class 'Symfony\Component\Validator\Constraint' not found in /home/devmecseminars/public_html/mec/vendor/symfony/validator/Constraints/IsNull.php:22
Stack trace:
#0 {main}
thrown in /home/devmecseminars/public_html/mec/vendor/symfony/validator/Constraints/IsNull.php on line 22