Fatal error: Uncaught Error: Class 'Contao\CoreBundle\Controller\AbstractController' not found in /home/benjamincb/demos/acdg-site/vendor/contao/core-bundle/src/Controller/BackendController.php:38 Stack trace: #0 {main} thrown in /home/benjamincb/demos/acdg-site/vendor/contao/core-bundle/src/Controller/BackendController.php on line 38