Fatal error: Uncaught Error: Class "PKP\controllers\grid\GridCellProvider" not found in C:\xampp\htdocs\journal\plugins\generic\staticPages\controllers\grid\StaticPageGridCellProvider.php:26 Stack trace: #0 {main} thrown in C:\xampp\htdocs\journal\plugins\generic\staticPages\controllers\grid\StaticPageGridCellProvider.php on line 26