Fatal error: Uncaught Error: Interface "TYPO3\CMS\Core\Site\Entity\SiteInterface" not found in /var/www/html/dev.hallescherfc.de/vendor/typo3/cms-core/Classes/Site/Entity/Site.php:41 Stack trace: #0 {main} thrown in /var/www/html/dev.hallescherfc.de/vendor/typo3/cms-core/Classes/Site/Entity/Site.php on line 41