Fatal error: Uncaught TypeError: Return value of JATSParser\Body\Document::extractSections() must be an instance of JATSParser\Body\void, none returned in /var/www/html/portal3/plugins/themes/newPortal/jatsParser/src/JATSParser/Body/Document.inc.php:122 Stack trace: #0 /var/www/html/portal3/plugins/themes/newPortal/jatsParser/src/JATSParser/Body/Document.inc.php(32): JATSParser\Body\Document->extractSections() #1 /var/www/html/portal3/plugins/themes/newPortal/NewPortalThemePlugin.inc.php(209): JATSParser\Body\Document->__construct('/var/www/files/...') #2 /var/www/html/portal3/lib/pkp/classes/plugins/HookRegistry.inc.php(107): NewPortalThemePlugin->jatsParser('TemplateManager...', Array) #3 /var/www/html/portal3/lib/pkp/classes/template/PKPTemplateManager.inc.php(856): HookRegistry::call('TemplateManager...', Array) #4 /var/www/html/portal3/pages/article/ArticleHandler.inc.php(197): PKPTemplateManager->display('frontend/pages/...') #5 /var/www/html/portal3/lib/pkp/classes/core/PKPRouter.inc.php(390): ArticleHandler->view( in /var/www/html/portal3/plugins/themes/newPortal/jatsParser/src/JATSParser/Body/Document.inc.php on line 122