Fatal error: Uncaught Error: Interface "TYPO3\CMS\Core\SingletonInterface" not found in /var/www/html/dev.hallescherfc.de/vendor/tpwd/ke_search/Classes/Lib/Db.php:49 Stack trace: #0 {main} thrown in /var/www/html/dev.hallescherfc.de/vendor/tpwd/ke_search/Classes/Lib/Db.php on line 49