Fatal error: Uncaught Error: Interface 'Symfony\Component\Security\Core\User\UserProviderInterface' not found in /home/benjamincb/demos/acdg-site/vendor/contao/core-bundle/src/Security/User/ContaoUserProvider.php:30 Stack trace: #0 {main} thrown in /home/benjamincb/demos/acdg-site/vendor/contao/core-bundle/src/Security/User/ContaoUserProvider.php on line 30