Fatal error: Uncaught Error: Interface "TYPO3\CMS\Backend\View\BackendLayout\DataProviderInterface" not found in /home/rcmch/test.m-s-i.ch/vendor/typo3/cms-backend/Classes/View/BackendLayout/DefaultDataProvider.php:38 Stack trace: #0 {main} thrown in /home/rcmch/test.m-s-i.ch/vendor/typo3/cms-backend/Classes/View/BackendLayout/DefaultDataProvider.php on line 38