Fatal error: Uncaught Error: Class "Magento\Framework\Data\Form\Element\AbstractElement" not found in /var/www/magento/html/app/code/MGS/Lookbook/Block/Adminhtml/Edit/Tab/Image.php:17 Stack trace: #0 {main} thrown in /var/www/magento/html/app/code/MGS/Lookbook/Block/Adminhtml/Edit/Tab/Image.php on line 17