Fatal error: Uncaught Error: Call to a member function getData() on null in /homepages/9/d909200721/htdocs/ojs-3.3/plugins/generic/pdfJsViewer/PdfJsViewerPlugin.inc.php:88 Stack trace: #0 /homepages/9/d909200721/htdocs/ojs-3.3/lib/pkp/classes/plugins/HookRegistry.inc.php(107): PdfJsViewerPlugin->submissionCallback('ArticleHandler:...', Array) #1 /homepages/9/d909200721/htdocs/ojs-3.3/pages/article/ArticleHandler.inc.php(330): HookRegistry::call('ArticleHandler:...', Array) #2 /homepages/9/d909200721/htdocs/ojs-3.3/lib/pkp/classes/core/PKPRouter.inc.php(395): ArticleHandler->view(Array, Object(Request)) #3 /homepages/9/d909200721/htdocs/ojs-3.3/lib/pkp/classes/core/PKPPageRouter.inc.php(246): PKPRouter->_authorizeInitializeAndCallRequest(Array, Object(Request), Array, false) #4 /homepages/9/d909200721/htdocs/ojs-3.3/lib/pkp/classes/core/Dispatcher.inc.php(144): PKPPageRouter->route(Object(Request)) #5 /homepages/9/d909200721/htdocs/ojs-3.3/lib/pkp/classes/core/PKPApplication.inc.php(362): Dispatcher->dispatch(Object(Reques in /homepages/9/d909200721/htdocs/ojs-3.3/plugins/generic/pdfJsViewer/PdfJsViewerPlugin.inc.php on line 88