Fatal error: Uncaught Error: Call to a member function getId() on null in /home/oiccpres/public_html/plugins/generic/authorListing/AuthorListingPageHandler.php:44 Stack trace: #0 [internal function]: APP\plugins\generic\authorListing\AuthorListingPageHandler->index() #1 /home/oiccpres/public_html/lib/pkp/classes/core/PKPRouter.php(335): call_user_func() #2 /home/oiccpres/public_html/lib/pkp/classes/core/PKPPageRouter.php(277): PKP\core\PKPRouter->_authorizeInitializeAndCallRequest() #3 /home/oiccpres/public_html/lib/pkp/classes/core/Dispatcher.php(165): PKP\core\PKPPageRouter->route() #4 /home/oiccpres/public_html/lib/pkp/classes/core/PKPApplication.php(388): PKP\core\Dispatcher->dispatch() #5 /home/oiccpres/public_html/index.php(21): PKP\core\PKPApplication->execute() #6 {main} thrown in /home/oiccpres/public_html/plugins/generic/authorListing/AuthorListingPageHandler.php on line 44