Chào mọi người! Mình mới dùng Joomla và đang cài trên Localhost Win8. Khi khách gửi bài thành công bằng Phoca guestbook báo lỗi: Notice: Undefined index: success in C:\wamp\www\HT\templates\protostar\html\layouts\joomla\system\message.php on line 20 Call Stack #TimeMemoryFunctionLocation 10.0004248640{main}( )..\index.php:0 20.04893585832JApplicationCms->execute( )..\index.php:45 30.215810925968JApplicationSite->render( )..\cms.php:258 40.215910926696JApplicationCms->render( )..\site.php:745 50.221811266576JDocumentHTML->render( )..\cms.php:1059 60.221811266600JDocumentHTML->_renderTemplate( )..\html.php:477 70.296213151592JDocumentHTML->getBuffer( )..\html.php:697 80.296913166920JDocumentRendererMessage->render( )..\html.php:411 90.297513175648JLayoutHelper::render( )..\message.php:55 100.299613268384JLayoutFile->render( )..\helper.php:48 110.300913295232include('C:\wamp\www\HT\templates\protostar\html\layouts\joomla\system\message.php' )..\file.php:95 ">× success Post saved, It will be displayed after the Administrator's approval Nhờ mọi người hướng dẫn xử lý giúp. Trân trọng cảm ơn!