Fatal error: Uncaught TypeError: PKP\i18n\Locale::getMetadata(): Argument #1 ($locale) must be of type string, null given, called in /var/www/html/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Support/Facades/Facade.php on line 338 and defined in /var/www/html/lib/pkp/classes/i18n/Locale.php:207 Stack trace: #0 /var/www/html/lib/pkp/lib/vendor/laravel/framework/src/Illuminate/Support/Facades/Facade.php(338): PKP\i18n\Locale->getMetadata(NULL) #1 /var/www/html/classes/issue/IssueGalley.php(89): Illuminate\Support\Facades\Facade::__callStatic('getMetadata', Array) #2 /var/www/html/cache/t_compile/e26d2de610226743d9feff244fb14ef53700227f^9190456890661656c2db668fc3c363ee4354c517_0.app.frontendobjectsgalley_link.tpl.php(77): APP\issue\IssueGalley->getGalleyLabel() #3 /var/www/html/lib/pkp/lib/vendor/smarty/smarty/libs/sysplugins/smarty_template_resource_base.php(123): content_6927d8e3d88889_18777090(Object(Smarty_Internal_Template)) #4 /var/www/html/lib/pkp/lib/vendor/smarty/smarty/libs/sysplugins/smarty_template_compiled.php(114): Smarty_Template_Resource_Base->getRenderedTemplateCode(Object(Smarty_Internal_Template)) #5 /var/www/html/lib/pkp/lib/vendor/smarty/smarty/libs/sysplugins/smarty_internal_template.php(217): Smarty_Template_Compiled->render(Object(Smarty_Internal_Template)) #6 /var/www/html/lib/pkp/lib/vendor/smarty/smarty/libs/sysplugins/smarty_internal_template.php(386): Smarty_Internal_Template->render() #7 /var/www/html/cache/t_compile/e26d2de610226743d9feff244fb14ef53700227f^26de9c47ced54328a8eb56e39bb4d4079aa049c6_0.app.frontendobjectsissue_toc.tpl.php(147): Smarty_Internal_Template->_subTemplateRender('app:frontend/ob...', NULL, 'e26d2de61022674...', 0, 3600, Array, 0, true) #8 /var/www/html/lib/pkp/lib/vendor/smarty/smarty/libs/sysplugins/smarty_template_resource_base.php(123): content_6927d8e3964b41_72706319(Object(Smarty_Internal_Template)) #9 /var/www/html/lib/pkp/lib/vendor/smarty/smarty/libs/sysplugins/smarty_template_compiled.php(114): Smarty_Template_Resource_Base->getRenderedTemplateCode(Object(Smarty_Internal_Template)) #10 /var/www/html/lib/pkp/lib/vendor/smarty/smarty/libs/sysplugins/smarty_internal_template.php(217): Smarty_Template_Compiled->render(Object(Smarty_Internal_Template)) #11 /var/www/html/lib/pkp/lib/vendor/smarty/smarty/libs/sysplugins/smarty_internal_template.php(386): Smarty_Internal_Template->render() #12 /var/www/html/cache/t_compile/e26d2de610226743d9feff244fb14ef53700227f^fcbc2cabc0d4dff6219d7e4b5d36c1363533cfd8_0.app.frontendpagesissue.tpl.php(51): Smarty_Internal_Template->_subTemplateRender('app:frontend/ob...', NULL, 'e26d2de61022674...', 0, 3600, Array, 0, false) #13 /var/www/html/lib/pkp/lib/vendor/smarty/smarty/libs/sysplugins/smarty_template_resource_base.php(123): content_6927d8e318ac77_51804947(Object(Smarty_Internal_Template)) #14 /var/www/html/lib/pkp/lib/vendor/smarty/smarty/libs/sysplugins/smarty_template_compiled.php(114): Smarty_Template_Resource_Base->getRenderedTemplateCode(Object(Smarty_Internal_Template)) #15 /var/www/html/lib/pkp/lib/vendor/smarty/smarty/libs/sysplugins/smarty_internal_template.php(217): Smarty_Template_Compiled->render(Object(Smarty_Internal_Template)) #16 /var/www/html/lib/pkp/lib/vendor/smarty/smarty/libs/sysplugins/smarty_internal_templatebase.php(238): Smarty_Internal_Template->render(false, 1) #17 /var/www/html/lib/pkp/lib/vendor/smarty/smarty/libs/sysplugins/smarty_internal_templatebase.php(134): Smarty_Internal_TemplateBase->_execute(Object(Smarty_Internal_Template), NULL, 'e26d2de61022674...', NULL, 1) #18 /var/www/html/lib/pkp/classes/template/PKPTemplateManager.php(1373): Smarty_Internal_TemplateBase->display('frontend/pages/...', NULL, 'e26d2de61022674...', NULL) #19 /var/www/html/pages/issue/IssueHandler.php(138): PKP\template\PKPTemplateManager->display('frontend/pages/...') #20 [internal function]: APP\pages\issue\IssueHandler->view(Array, Object(APP\core\Request)) #21 /var/www/html/lib/pkp/classes/core/PKPRouter.php(334): call_user_func(Array, Array, Object(APP\core\Request)) #22 /var/www/html/lib/pkp/classes/core/PKPPageRouter.php(278): PKP\core\PKPRouter->_authorizeInitializeAndCallRequest(Array, Object(APP\core\Request), Array, false) #23 /var/www/html/lib/pkp/classes/core/Dispatcher.php(165): PKP\core\PKPPageRouter->route(Object(APP\core\Request)) #24 /var/www/html/lib/pkp/classes/core/PKPApplication.php(395): PKP\core\Dispatcher->dispatch(Object(APP\core\Request)) #25 /var/www/html/index.php(21): PKP\core\PKPApplication->execute() #26 {main} thrown in /var/www/html/lib/pkp/classes/i18n/Locale.php on line 207