Fatal error: Uncaught Error: Class "Magento\Backend\Block\Widget\Grid\Extended" not found in /home/www/staging1.gamanorteweb.com/app/code/Sm/MegaMenu/Block/Adminhtml/MenuGroup/Grid.php:17 Stack trace: #0 {main} thrown in /home/www/staging1.gamanorteweb.com/app/code/Sm/MegaMenu/Block/Adminhtml/MenuGroup/Grid.php on line 17