Fatal error: Uncaught Error: Interface "Symfony\Component\Messenger\Stamp\StampInterface" not found in /srv/disk1/2895578/www/whittonphotographicclub.org.uk/concrete/src/Messenger/Stamp/SkipSendersStamp.php:11 Stack trace: #0 {main} thrown in /srv/disk1/2895578/www/whittonphotographicclub.org.uk/concrete/src/Messenger/Stamp/SkipSendersStamp.php on line 11