Fatal error: Uncaught Error: Class "TYPO3\CMS\Extbase\Configuration\ConfigurationManager" not found in /var/www/html/dev.hallescherfc.de/vendor/typo3/cms-form/Classes/Mvc/Configuration/ConfigurationManager.php:35 Stack trace: #0 {main} thrown in /var/www/html/dev.hallescherfc.de/vendor/typo3/cms-form/Classes/Mvc/Configuration/ConfigurationManager.php on line 35