Fatal error: Uncaught Error: Class 'Symfony\Component\HttpKernel\DependencyInjection\Extension' not found in /home/itscm/dev.its.cm/webserivesits/vendor/symfony/swiftmailer-bundle/DependencyInjection/SwiftmailerExtension.php:31 Stack trace: #0 {main} thrown in /home/itscm/dev.its.cm/webserivesits/vendor/symfony/swiftmailer-bundle/DependencyInjection/SwiftmailerExtension.php on line 31