Fatal error: Uncaught Error: Interface "TYPO3\CMS\Core\SingletonInterface" not found in /var/www/html/dev.hallescherfc.de/vendor/fluidtypo3/vhs/Classes/Service/PageService.php:29 Stack trace: #0 {main} thrown in /var/www/html/dev.hallescherfc.de/vendor/fluidtypo3/vhs/Classes/Service/PageService.php on line 29