Fatal error: Uncaught Error: Interface "TYPO3\CMS\Backend\Form\FormDataProviderInterface" not found in /var/www/html/dev.hallescherfc.de/vendor/typo3/cms-backend/Classes/Form/FormDataProvider/TcaFolder.php:30 Stack trace: #0 {main} thrown in /var/www/html/dev.hallescherfc.de/vendor/typo3/cms-backend/Classes/Form/FormDataProvider/TcaFolder.php on line 30