Fatal error: Uncaught Error: Class "Doctrine\Migrations\Configuration\AbstractFileConfiguration" not found in /srv/disk1/2895578/www/whittonphotographicclub.org.uk/concrete/vendor/doctrine/migrations/lib/Doctrine/Migrations/Configuration/JsonConfiguration.php:21 Stack trace: #0 {main} thrown in /srv/disk1/2895578/www/whittonphotographicclub.org.uk/concrete/vendor/doctrine/migrations/lib/Doctrine/Migrations/Configuration/JsonConfiguration.php on line 21