Fatal error: Uncaught Error: Class "TYPO3Fluid\Fluid\Core\ViewHelper\AbstractViewHelper" not found in /var/www/html/dev.hallescherfc.de/vendor/nng/nnhelpers/Classes/ViewHelpers/Ts/ExtConfViewHelper.php:18 Stack trace: #0 {main} thrown in /var/www/html/dev.hallescherfc.de/vendor/nng/nnhelpers/Classes/ViewHelpers/Ts/ExtConfViewHelper.php on line 18