Fatal error: Uncaught Error: Class "Symfony\Contracts\EventDispatcher\Event" not found in /home/pataplou/www/patrick/pataplouf/vendor/symfony/notifier/Event/MessageEvent.php:20 Stack trace: #0 {main} thrown in /home/pataplou/www/patrick/pataplouf/vendor/symfony/notifier/Event/MessageEvent.php on line 20