Fatal error: Uncaught Error: Class "PKP\plugins\GenericPlugin" not found in C:\xampp\htdocs\journal\plugins\generic\pdfJsViewer\PdfJsViewerPlugin.php:22 Stack trace: #0 {main} thrown in C:\xampp\htdocs\journal\plugins\generic\pdfJsViewer\PdfJsViewerPlugin.php on line 22