Fatal error: Uncaught Error: Interface "Symfony\Component\Config\Resource\ResourceInterface" not found in /srv/disk1/2895578/www/whittonphotographicclub.org.uk/concrete/vendor/symfony/config/Resource/SelfCheckingResourceInterface.php:20 Stack trace: #0 {main} thrown in /srv/disk1/2895578/www/whittonphotographicclub.org.uk/concrete/vendor/symfony/config/Resource/SelfCheckingResourceInterface.php on line 20