Fatal error: Uncaught Error: Class "PKP\controllers\grid\files\SelectableSubmissionFileListCategoryGridHandler" not found in /home/jurna812/public_html/lib/pkp/controllers/grid/files/query/ManageQueryNoteFilesGridHandler.php:27 Stack trace: #0 {main} thrown in /home/jurna812/public_html/lib/pkp/controllers/grid/files/query/ManageQueryNoteFilesGridHandler.php on line 27