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Fatal error: Uncaught Error: Call to a member function getJournalId() on null in /home/u230092611/domains/jurnal.unived.ac.id/public_html/classes/issue/IssueAction.inc.php:31 Stack trace: #0 /home/u230092611/domains/jurnal.unived.ac.id/public_html/pages/search/SearchHandler.inc.php(246): IssueAction->subscriptionRequired(NULL, Object(Journal)) #1 /home/u230092611/domains/jurnal.unived.ac.id/public_html/lib/pkp/classes/core/PKPRouter.inc.php(391): SearchHandler->authors(Array, Object(Request)) #2 /home/u230092611/domains/jurnal.unived.ac.id/public_html/lib/pkp/classes/core/PKPPageRouter.inc.php(231): PKPRouter->_authorizeInitializeAndCallRequest(Array, Object(Request), Array, false) #3 /home/u230092611/domains/jurnal.unived.ac.id/public_html/lib/pkp/classes/core/Dispatcher.inc.php(143): PKPPageRouter->route(Object(Request)) #4 /home/u230092611/domains/jurnal.unived.ac.id/public_html/lib/pkp/classes/core/PKPApplication.inc.php(281): Dispatcher->dispatch(Object(Request)) #5 /home/u230092611/domains/jurnal.unived.ac.id/public in /home/u230092611/domains/jurnal.unived.ac.id/public_html/classes/issue/IssueAction.inc.php on line 31