Fatal error: Uncaught Error: Class "TYPO3\CMS\Extbase\Domain\Model\AbstractFileFolder" not found in /var/www/html/dev.hallescherfc.de/vendor/typo3/cms-extbase/Classes/Domain/Model/Folder.php:21 Stack trace: #0 {main} thrown in /var/www/html/dev.hallescherfc.de/vendor/typo3/cms-extbase/Classes/Domain/Model/Folder.php on line 21