Fatal error: Uncaught Error: Interface "TYPO3\CMS\Core\SingletonInterface" not found in /var/www/html/dev.hallescherfc.de/vendor/codingms/additional-tca/Classes/Service/ContentTypeService.php:39 Stack trace: #0 {main} thrown in /var/www/html/dev.hallescherfc.de/vendor/codingms/additional-tca/Classes/Service/ContentTypeService.php on line 39