Fatal error: Uncaught Error: Class "TYPO3\CMS\Core\Middleware\BackendUserAuthenticator" not found in /var/www/html/dev.hallescherfc.de/vendor/typo3/cms-frontend/Classes/Middleware/BackendUserAuthenticator.php:40 Stack trace: #0 {main} thrown in /var/www/html/dev.hallescherfc.de/vendor/typo3/cms-frontend/Classes/Middleware/BackendUserAuthenticator.php on line 40