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Fatal error: Uncaught TypeError: Seboettg\CiteProc\Rendering\Name\Names::appendLabel(): Return value must be of type string, null returned in /home/artsurem.tr/public_html/plugins/generic/citationStyleLanguage/lib/vendor/seboettg/citeproc-php/src/Rendering/Name/Names.php:264 Stack trace: #0 /home/artsurem.tr/public_html/plugins/generic/citationStyleLanguage/lib/vendor/seboettg/citeproc-php/src/Rendering/Name/Names.php(223): Seboettg\CiteProc\Rendering\Name\Names->appendLabel() #1 /home/artsurem.tr/public_html/plugins/generic/citationStyleLanguage/lib/vendor/seboettg/citeproc-php/src/Rendering/Name/Substitute.php(122): Seboettg\CiteProc\Rendering\Name\Names->render() #2 /home/artsurem.tr/public_html/plugins/generic/citationStyleLanguage/lib/vendor/seboettg/citeproc-php/src/Rendering/Name/Names.php(243): Seboettg\CiteProc\Rendering\Name\Substitute->render() #3 /home/artsurem.tr/public_html/plugins/generic/citationStyleLanguage/lib/vendor/seboettg/citeproc-php/src/Rendering/Choose/ChooseIf.php(79): Seboettg\CiteProc\Rendering\Name\Names->render() #4 /home/artsurem.tr/public_html/plugins/generic/citationStyleLanguage/lib/vendor/seboettg/citeproc-php/src/Rendering/Choose/Choose.php(83): Seboettg\CiteProc\Rendering\Choose\ChooseIf->render() #5 /home/artsurem.tr/public_html/plugins/generic/citationStyleLanguage/lib/vendor/seboettg/citeproc-php/src/Style/Macro.php(86): Seboettg\CiteProc\Rendering\Choose\Choose->render() #6 /home/artsurem.tr/public_html/plugins/generic/citationStyleLanguage/lib/vendor/seboettg/citeproc-php/src/Rendering/Text.php(290): Seboettg\CiteProc\Style\Macro->render() #7 /home/artsurem.tr/public_html/plugins/generic/citationStyleLanguage/lib/vendor/seboettg/citeproc-php/src/Rendering/Text.php(120): Seboettg\CiteProc\Rendering\Text->renderMacro() #8 /home/artsurem.tr/public_html/plugins/generic/citationStyleLanguage/lib/vendor/seboettg/citeproc-php/src/Rendering/Group.php(113): Seboettg\CiteProc\Rendering\Text->render() #9 /home/artsurem.tr/public_html/plugins/generic/citationStyleLanguage/lib/vendor/seboettg/citeproc-php/src/Rendering/Choose/ChooseIf.php(79): Seboettg\CiteProc\Rendering\Group->render() #10 /home/artsurem.tr/public_html/plugins/generic/citationStyleLanguage/lib/vendor/seboettg/citeproc-php/src/Rendering/Choose/Choose.php(98): Seboettg\CiteProc\Rendering\Choose\ChooseIf->render() #11 /home/artsurem.tr/public_html/plugins/generic/citationStyleLanguage/lib/vendor/seboettg/citeproc-php/src/Rendering/Layout.php(130): Seboettg\CiteProc\Rendering\Choose\Choose->render() #12 /home/artsurem.tr/public_html/plugins/generic/citationStyleLanguage/lib/vendor/seboettg/citeproc-php/src/Rendering/Layout.php(97): Seboettg\CiteProc\Rendering\Layout->renderSingle() #13 /home/artsurem.tr/public_html/plugins/generic/citationStyleLanguage/lib/vendor/seboettg/citeproc-php/src/Style/Bibliography.php(76): Seboettg\CiteProc\Rendering\Layout->render() #14 /home/artsurem.tr/public_html/plugins/generic/citationStyleLanguage/lib/vendor/seboettg/citeproc-php/src/CiteProc.php(137): Seboettg\CiteProc\Style\Bibliography->render() #15 /home/artsurem.tr/public_html/plugins/generic/citationStyleLanguage/lib/vendor/seboettg/citeproc-php/src/CiteProc.php(183): Seboettg\CiteProc\CiteProc->bibliography() #16 /home/artsurem.tr/public_html/plugins/generic/citationStyleLanguage/CitationStyleLanguagePlugin.php(599): Seboettg\CiteProc\CiteProc->render() #17 /home/artsurem.tr/public_html/plugins/generic/citationStyleLanguage/pages/CitationStyleLanguageHandler.php(80): APP\plugins\generic\citationStyleLanguage\CitationStyleLanguagePlugin->getCitation() #18 [internal function]: APP\plugins\generic\citationStyleLanguage\pages\CitationStyleLanguageHandler->get() #19 /home/artsurem.tr/public_html/lib/pkp/classes/core/PKPRouter.php(334): call_user_func() #20 /home/artsurem.tr/public_html/lib/pkp/classes/core/PKPPageRouter.php(277): PKP\core\PKPRouter->_authorizeInitializeAndCallRequest() #21 /home/artsurem.tr/public_html/lib/pkp/classes/core/Dispatcher.php(165): PKP\core\PKPPageRouter->route() #22 /home/artsurem.tr/public_html/lib/pkp/classes/core/PKPApplication.php(388): PKP\core\Dispatcher->dispatch() #23 /home/artsurem.tr/public_html/index.php(21): PKP\core\PKPApplication->execute() #24 {main} thrown in /home/artsurem.tr/public_html/plugins/generic/citationStyleLanguage/lib/vendor/seboettg/citeproc-php/src/Rendering/Name/Names.php on line 264