Fatal error: Uncaught Error: Class 'Symfony\Component\Security\Core\Authorization\Voter\Voter' not found in /home/benjamincb/demos/acdg-site/vendor/contao/core-bundle/src/Security/Voter/MemberGroupVoter.php:21 Stack trace: #0 {main} thrown in /home/benjamincb/demos/acdg-site/vendor/contao/core-bundle/src/Security/Voter/MemberGroupVoter.php on line 21