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