Fatal error: Uncaught Error: Interface "TYPO3\CMS\Backend\View\BackendLayout\DataProviderInterface" not found in /var/www/html/dev.hallescherfc.de/vendor/typo3/cms-backend/Classes/View/BackendLayout/DefaultDataProvider.php:31 Stack trace: #0 {main} thrown in /var/www/html/dev.hallescherfc.de/vendor/typo3/cms-backend/Classes/View/BackendLayout/DefaultDataProvider.php on line 31