Fatal error: Uncaught Error: Class "Magento\Backend\Block\Widget\Grid\Container" not found in /home/www/staging1.gamanorteweb.com/app/code/Sm/MegaMenu/Block/Adminhtml/MenuGroup.php:11 Stack trace: #0 {main} thrown in /home/www/staging1.gamanorteweb.com/app/code/Sm/MegaMenu/Block/Adminhtml/MenuGroup.php on line 11