Fatal error: Uncaught Error: Call to undefined function _() in /home/longb930/public_html/views/theme-store/theme-setting/theme-sidebar.php:30 Stack trace: #0 /home/longb930/public_html/system/libraries/Hook.php(307): ThemeSidebar::postNew(Array) #1 /home/longb930/public_html/system/libraries/Hook.php(331): WP_Hook->apply_filters('', Array) #2 /home/longb930/public_html/system/plugin.php(453): WP_Hook->do_action(Array) #3 /home/longb930/public_html/views/theme-store/include/sidebar.php(4): do_action('theme_sidebar', Array) #4 /home/longb930/public_html/application/libraries/template.php(708): include('/home/longb930/...') #5 /home/longb930/public_html/views/theme-store/template-sidebar-right.php(20): Template::partial('include/sidebar') #6 /home/longb930/public_html/system/core/Loader.php(839): include('/home/longb930/...') #7 /home/longb930/public_html/system/core/Loader.php(420): CI_Loader->_ci_load(Array) #8 /home/longb930/public_html/application/libraries/template.php(346): CI_Loader->view('theme-store/tem...', Array) #9 /home/longb930/public_html/application/controllers/frontend/post.php(47): Template->render() #10 /home/longb930/public_html/system/core/CodeIgniter.php(360): Post->index('tai-lieu-1') #11 /home/longb930/public_html/index.php(224): require_once('/home/longb930/...') #12 {main} thrown in /home/longb930/public_html/views/theme-store/theme-setting/theme-sidebar.php on line 30