Fatal error: Uncaught Error: Class 'Magento\Catalog\Controller\Adminhtml\Product\Set' not found in /home/esecureh/public_html/magdemo/vendor/magento/module-catalog/Controller/Adminhtml/Product/Set/Add.php:11 Stack trace: #0 {main} thrown in /home/esecureh/public_html/magdemo/vendor/magento/module-catalog/Controller/Adminhtml/Product/Set/Add.php on line 11