Fatal error: Uncaught Error: Class "TYPO3\CMS\Install\Configuration\AbstractFeature" not found in /var/www/html/dev.hallescherfc.de/vendor/typo3/cms-install/Classes/Configuration/Context/ContextFeature.php:25 Stack trace: #0 {main} thrown in /var/www/html/dev.hallescherfc.de/vendor/typo3/cms-install/Classes/Configuration/Context/ContextFeature.php on line 25