Fatal error: Uncaught Error: Class "Symfony\Component\Notifier\Transport\RoundRobinTransport" not found in /home/pataplou/www/patrick/pataplouf/vendor/symfony/notifier/Transport/FailoverTransport.php:21 Stack trace: #0 {main} thrown in /home/pataplou/www/patrick/pataplouf/vendor/symfony/notifier/Transport/FailoverTransport.php on line 21