Fatal error: Uncaught Error: Class 'Symfony\Component\DependencyInjection\Compiler\MergeExtensionConfigurationPass' not found in /home/devmecseminars/public_html/mec/vendor/symfony/http-kernel/DependencyInjection/MergeExtensionConfigurationPass.php:22 Stack trace: #0 {main} thrown in /home/devmecseminars/public_html/mec/vendor/symfony/http-kernel/DependencyInjection/MergeExtensionConfigurationPass.php on line 22