Fatal error: Uncaught Error: Class 'Symfony\Component\Security\Core\Authentication\Token\AbstractToken' not found in /home/benjamincb/demos/acdg-site/vendor/contao/core-bundle/src/Security/Authentication/Token/FrontendPreviewToken.php:18 Stack trace: #0 {main} thrown in /home/benjamincb/demos/acdg-site/vendor/contao/core-bundle/src/Security/Authentication/Token/FrontendPreviewToken.php on line 18