Fatal error: Uncaught Error: Class "TYPO3\CMS\Core\Resource\AbstractFile" not found in /var/www/html/dev.hallescherfc.de/vendor/typo3/cms-core/Classes/Resource/File.php:23 Stack trace: #0 {main} thrown in /var/www/html/dev.hallescherfc.de/vendor/typo3/cms-core/Classes/Resource/File.php on line 23