Fatal error: Uncaught Error: Class 'Symfony\Component\Validator\Mapping\Loader\AbstractLoader' not found in /home/devmecseminars/public_html/mec/vendor/symfony/validator/Mapping/Loader/FileLoader.php:24 Stack trace: #0 {main} thrown in /home/devmecseminars/public_html/mec/vendor/symfony/validator/Mapping/Loader/FileLoader.php on line 24