Fatal error: Uncaught Error: Class 'Symfony\Component\EventDispatcher\Event' not found in /home/lafaamicps/www/symfony/vendor/friendsofsymfony/comment-bundle/FOS/CommentBundle/Event/ThreadEvent.php:22 Stack trace: #0 {main} thrown in /home/lafaamicps/www/symfony/vendor/friendsofsymfony/comment-bundle/FOS/CommentBundle/Event/ThreadEvent.php on line 22