Fatal error: Uncaught Error: Class "TYPO3\CMS\Core\Middleware\BackendUserAuthenticator" not found in /home/rcmch/test.m-s-i.ch/vendor/typo3/cms-frontend/Classes/Middleware/BackendUserAuthenticator.php:41 Stack trace: #0 {main} thrown in /home/rcmch/test.m-s-i.ch/vendor/typo3/cms-frontend/Classes/Middleware/BackendUserAuthenticator.php on line 41