Fatal error: Uncaught Error: Interface 'TYPO3\CMS\Core\SingletonInterface' not found in /home/.sites/884/site2951/web/test/luger/typo3conf/ext/gridelements/Classes/Hooks/PageRenderer.php:40
Stack trace:
#0 {main}
  thrown in /home/.sites/884/site2951/web/test/luger/typo3conf/ext/gridelements/Classes/Hooks/PageRenderer.php on line 40