Fatal error: Uncaught Error: Interface "TYPO3\CMS\Core\SingletonInterface" not found in /home/cmsshareacopy/public_html/TYPO3/vendor/typo3/cms-extbase/Classes/Mvc/Controller/MvcPropertyMappingConfigurationService.php:51 Stack trace: #0 {main} thrown in /home/cmsshareacopy/public_html/TYPO3/vendor/typo3/cms-extbase/Classes/Mvc/Controller/MvcPropertyMappingConfigurationService.php on line 51