Fatal error: Uncaught Error: Class 'Magento\Backend\App\AbstractAction' not found in /home/esecureh/public_html/magdemo/vendor/magento/module-user/Controller/Adminhtml/Auth.php:18 Stack trace: #0 {main} thrown in /home/esecureh/public_html/magdemo/vendor/magento/module-user/Controller/Adminhtml/Auth.php on line 18