Fatal error: Uncaught Error: Class 'Symfony\Component\HttpKernel\DependencyInjection\Extension' not found in /home/lafaamicps/www/symfony/vendor/sonata-project/notification-bundle/DependencyInjection/SonataNotificationExtension.php:29 Stack trace: #0 {main} thrown in /home/lafaamicps/www/symfony/vendor/sonata-project/notification-bundle/DependencyInjection/SonataNotificationExtension.php on line 29