Fatal error: Declaration of JWeiland\Jwsitepackage\ViewHelpers\ExistsViewHelper::render() must be compatible with TYPO3Fluid\Fluid\Core\ViewHelper\AbstractConditionViewHelper::render(): mixed in /www/htdocs/w01eab5b/1_adbj/T14-1/typo3conf/ext/jwsitepackage/Classes/ViewHelpers/ExistsViewHelper.php on line 69