Fatal error: Uncaught Error: Interface 'Symfony\Component\Notifier\Channel\ChannelPolicyInterface' not found in /home/benjamincb/demos/acdg/vendor/symfony/notifier/Channel/ChannelPolicy.php:19 Stack trace: #0 {main} thrown in /home/benjamincb/demos/acdg/vendor/symfony/notifier/Channel/ChannelPolicy.php on line 19