Fatal error: Uncaught TypeError: PKP\pages\announcement\AnnouncementHandler::isAnnouncementsEnabled(): Return value must be of type bool, null returned in /home/ijiert24/repo.ijiert.org/lib/pkp/pages/announcement/AnnouncementHandler.php:107 Stack trace: #0 /home/ijiert24/repo.ijiert.org/lib/pkp/pages/announcement/AnnouncementHandler.php(42): PKP\pages\announcement\AnnouncementHandler->isAnnouncementsEnabled(Object(APP\core\Request)) #1 [internal function]: PKP\pages\announcement\AnnouncementHandler->index(Array, Object(APP\core\Request)) #2 /home/ijiert24/repo.ijiert.org/lib/pkp/classes/core/PKPRouter.php(334): call_user_func(Array, Array, Object(APP\core\Request)) #3 /home/ijiert24/repo.ijiert.org/lib/pkp/classes/core/PKPPageRouter.php(277): PKP\core\PKPRouter->_authorizeInitializeAndCallRequest(Array, Object(APP\core\Request), Array, false) #4 /home/ijiert24/repo.ijiert.org/lib/pkp/classes/core/Dispatcher.php(165): PKP\core\PKPPageRouter->route(Object(APP\core\Request)) #5 /home/ijiert24/repo.ijiert.org/lib/pkp/classes/core/PKPApplication.php(388): PKP\core\Dispatcher->dispatch(Object(APP\core\Request)) #6 /home/ijiert24/repo.ijiert.org/index.php(21): PKP\core\PKPApplication->execute() #7 {main} thrown in /home/ijiert24/repo.ijiert.org/lib/pkp/pages/announcement/AnnouncementHandler.php on line 107