Fatal error: Declaration of CrossRefExportPlugin::executeExportAction($request, $objects, $filter, $tab, $objectsFileNamePart, $noValidation = null) must be compatible with APP\plugins\PubObjectsExportPlugin::executeExportAction($request, $objects, $filter, $tab, $objectsFileNamePart, $noValidation = null, $shouldRedirect = true) in /var/www/journals.spu.ac.ke/public_html/plugins/importexport/crossref/CrossRefExportPlugin.inc.php on line 191