Fatal error: Uncaught Error: Class "TYPO3\CMS\Backend\View\BackendLayout\Grid\GridColumn" not found in /var/www/html/cwtypo3/vendor/b13/container/Classes/Backend/Grid/ContainerGridColumn.php:21 Stack trace: #0 {main} thrown in /var/www/html/cwtypo3/vendor/b13/container/Classes/Backend/Grid/ContainerGridColumn.php on line 21