Fatal error: Uncaught Error: Call to a member function wasEmpty() on array in /home/periodicos34/public_html/cache/t_compile/99a3830e2070db87ecf2a2b8f37e899dcfc0516a^5d0ca16a7c78afd59d26eb1b852e00f92f50a8d9_0.app.frontendpagescatalogCategory.tpl.php:60 Stack trace: #0 /home/periodicos34/public_html/lib/pkp/lib/vendor/smarty/smarty/libs/sysplugins/smarty_template_resource_base.php(123): content_6ac556f591f688_39027756() #1 /home/periodicos34/public_html/lib/pkp/lib/vendor/smarty/smarty/libs/sysplugins/smarty_template_compiled.php(114): Smarty_Template_Resource_Base->getRenderedTemplateCode() #2 /home/periodicos34/public_html/lib/pkp/lib/vendor/smarty/smarty/libs/sysplugins/smarty_internal_template.php(217): Smarty_Template_Compiled->render() #3 /home/periodicos34/public_html/lib/pkp/lib/vendor/smarty/smarty/libs/sysplugins/smarty_internal_templatebase.php(238): Smarty_Internal_Template->render() #4 /home/periodicos34/public_html/lib/pkp/lib/vendor/smarty/smarty/libs/sysplugins/smarty_internal_templatebase.php(134): Smarty_Internal_TemplateBase->_execute() #5 /home/periodicos34/public_html/lib/pkp/classes/template/PKPTemplateManager.inc.php(1250): Smarty_Internal_TemplateBase->display() #6 /home/periodicos34/public_html/lib/pkp/pages/catalog/PKPCatalogHandler.inc.php(91): PKPTemplateManager->display() #7 /home/periodicos34/public_html/lib/pkp/classes/core/PKPRouter.inc.php(397): PKPCatalogHandler->category() #8 /home/periodicos34/public_html/lib/pkp/classes/core/PKPPageRouter.inc.php(246): PKPRouter->_authorizeInitializeAndCallRequest() #9 /home/periodicos34/public_html/lib/pkp/classes/core/Dispatcher.inc.php(144): PKPPageRouter->route() #10 /home/periodicos34/public_html/lib/pkp/classes/core/PKPApplication.inc.php(360): Dispatcher->dispatch() #11 /home/periodicos34/public_html/index.php(68): PKPApplication->execute() #12 {main} thrown in /home/periodicos34/public_html/cache/t_compile/99a3830e2070db87ecf2a2b8f37e899dcfc0516a^5d0ca16a7c78afd59d26eb1b852e00f92f50a8d9_0.app.frontendpagescatalogCategory.tpl.php on line 60