Fatal error: Uncaught Error: Class "PKP\linkAction\LinkAction" not found in /var/www/html/lib/pkp/controllers/api/file/linkAction/DownloadLibraryFileLinkAction.php:23 Stack trace: #0 {main} thrown in /var/www/html/lib/pkp/controllers/api/file/linkAction/DownloadLibraryFileLinkAction.php on line 23