Fatal error: Uncaught Error: Call to a member function getId() on null in /www/wwwroot/turkjgastroenterol.org/lib/pkp/pages/libraryFiles/LibraryFileHandler.inc.php:43 Stack trace: #0 /www/wwwroot/turkjgastroenterol.org/lib/pkp/classes/core/PKPRouter.inc.php(397): LibraryFileHandler->downloadPublic() #1 /www/wwwroot/turkjgastroenterol.org/lib/pkp/classes/core/PKPPageRouter.inc.php(246): PKPRouter->_authorizeInitializeAndCallRequest() #2 /www/wwwroot/turkjgastroenterol.org/lib/pkp/classes/core/Dispatcher.inc.php(144): PKPPageRouter->route() #3 /www/wwwroot/turkjgastroenterol.org/lib/pkp/classes/core/PKPApplication.inc.php(360): Dispatcher->dispatch() #4 /www/wwwroot/turkjgastroenterol.org/index.php(68): PKPApplication->execute() #5 {main} thrown in /www/wwwroot/turkjgastroenterol.org/lib/pkp/pages/libraryFiles/LibraryFileHandler.inc.php on line 43