Fatal error: Uncaught Error: Class "Symfony\Component\HttpKernel\DependencyInjection\Extension" not found in /var/www/bethesda/vendor/symfony/swiftmailer-bundle/DependencyInjection/SwiftmailerExtension.php:31 Stack trace: #0 {main} thrown in /var/www/bethesda/vendor/symfony/swiftmailer-bundle/DependencyInjection/SwiftmailerExtension.php on line 31