Fatal error: Uncaught Error: Class 'Symfony\Component\Validator\Exception\InvalidArgumentException' not found in /home/devmecseminars/public_html/mec/vendor/symfony/validator/Exception/UnsupportedMetadataException.php:17 Stack trace: #0 {main} thrown in /home/devmecseminars/public_html/mec/vendor/symfony/validator/Exception/UnsupportedMetadataException.php on line 17