Fatal error: Uncaught Error: Class "TYPO3Fluid\Fluid\Core\ViewHelper\AbstractViewHelper" not found in /var/www/html/dev.hallescherfc.de/vendor/georgringer/news/Classes/ViewHelpers/Be/IsCheckboxActiveViewHelper.php:17 Stack trace: #0 {main} thrown in /var/www/html/dev.hallescherfc.de/vendor/georgringer/news/Classes/ViewHelpers/Be/IsCheckboxActiveViewHelper.php on line 17