OJS系统3.4版本使用过程中论文预览失效

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thrown in /home/esci/localhost/www/lib/pkp/classes/plugins/PKPPubIdPlugin.php on line 511
#21 {main}
#20 /home/esci/localhost/www/index.php(21): PKP\core\PKPApplication->execute()
#19 /home/esci/localhost/www/lib/pkp/classes/core/PKPApplication.php(388): PKP\core\Dispatcher->dispatch(Object(APP\core\Request))
#18 /home/esci/localhost/www/lib/pkp/classes/core/Dispatcher.php(165): PKP\core\PKPPageRouter->route(Object(APP\core\Request))
#17 /home/esci/localhost/www/lib/pkp/classes/core/PKPPageRouter.php(277): PKP\core\PKPRouter->_authorizeInitializeAndCallRequest(Array, Object(APP\core\Request), Array, false)
#16 /home/esci/localhost/www/lib/pkp/classes/core/PKPRouter.php(334): call_user_func(Array, Array, Object(APP\core\Request))
#15 [internal function]: APP\pages\issue\IssueHandler->view(Array, Object(APP\core\Request))
#14 /home/esci/localhost/www/pages/issue/IssueHandler.php(138): PKP\template\PKPTemplateManager->display(‘frontend/pages/…’)
#13 /home/esci/localhost/www/lib/pkp/classes/template/PKPTemplateManager.php(1368): Smarty_Internal_TemplateBase->display(‘frontend/pages/…’, NULL, ‘e35ba3ad88c8e24…’, NULL)
#12/home/esci/localhost/www/lib/pkp/lib/vendor/smarty/smarty/libs/sysplugins/smarty_internal_templatebase.php(134): Smarty_Internal_TemplateBase->_execute(Object(Smarty_Internal_Template), NULL, ‘e35ba3ad88c8e24…’, NULL, 1)
#11/home/esci/localhost/www/lib/pkp/lib/vendor/smarty/smarty/libs/sysplugins/smarty_internal_templatebase.php(238): Smarty_Internal_Template->render(false, 1)
#10/home/esci/localhost/www/lib/pkp/lib/vendor/smarty/smarty/libs/sysplugins/smarty_internal_template.php(217): Smarty_Template_Compiled->render(Object(Smarty_Internal_Template))
#9/home/esci/localhost/www/lib/pkp/lib/vendor/smarty/smarty/libs/sysplugins/smarty_template_compiled.php(114): Smarty_Template_Resource_Base->getRenderedTemplateCode(Object(Smarty_Internal_Template))
#8/home/esci/localhost/www/lib/pkp/lib/vendor/smarty/smarty/libs/sysplugins/smarty_template_resource_base.php(123): content_65ec46301fa276_56308197(Object(Smarty_Internal_Template))
#7/home/esci/localhost/www/cache/t_compile/e35ba3ad88c8e24bc4de57abe8230f54bf65149d^fcbc2cabc0d4dff6219d7e4b5d36c1363533cfd8_0.app.frontendpagesissue.tpl.php(43): Smarty_Internal_Template->_subTemplateRender(‘app:frontend/ob…’, NULL, ‘e35ba3ad88c8e24…’, 0, 3600, Array, 0, false)
#6/home/esci/localhost/www/lib/pkp/lib/vendor/smarty/smarty/libs/sysplugins/smarty_internal_template.php(386): Smarty_Internal_Template->render()
#5/home/esci/localhost/www/lib/pkp/lib/vendor/smarty/smarty/libs/sysplugins/smarty_internal_template.php(217): Smarty_Template_Compiled->render(Object(Smarty_Internal_Template))
#4/home/esci/localhost/www/lib/pkp/lib/vendor/smarty/smarty/libs/sysplugins/smarty_template_compiled.php(114): Smarty_Template_Resource_Base->getRenderedTemplateCode(Object(Smarty_Internal_Template))
#3/home/esci/localhost/www/lib/pkp/lib/vendor/smarty/smarty/libs/sysplugins/smarty_template_resource_base.php(123): content_65ec4630297204_87235674(Object(Smarty_Internal_Template))
#2/home/esci/localhost/www/cache/t_compile/e35ba3ad88c8e24bc4de57abe8230f54bf65149d^26de9c47ced54328a8eb56e39bb4d4079aa049c6_0.app.frontendobjectsissue_toc.tpl.php(71): APP\plugins\PubIdPlugin->getPubId(Object(APP\issue\Issue))
#1 /home/esci/localhost/www/classes/plugins/PubIdPlugin.php(200): PKP\plugins\PKPPubIdPlugin->getContext(NULL)
#0 /home/esci/localhost/www/lib/pkp/classes/plugins/PKPPubIdPlugin.php(511): assert(false, ‘assert(is_numer…’)
Best regadrs, Pirate