Fatal error: Uncaught Error: Class 'Symfony\Component\Notifier\Channel\AbstractChannel' not found in /home/www/cinemaude2021/core-cinemaude/vendor/symfony/notifier/Channel/ChatChannel.php:24 Stack trace: #0 {main} thrown in /home/www/cinemaude2021/core-cinemaude/vendor/symfony/notifier/Channel/ChatChannel.php on line 24