Fatal error: Uncaught Error: Class 'Magento\Framework\DB\DataConverter\SerializedToJson' not found in /home/esecureh/public_html/magdemo/vendor/magento/module-widget/Setup/LayoutUpdateConverter.php:19 Stack trace: #0 {main} thrown in /home/esecureh/public_html/magdemo/vendor/magento/module-widget/Setup/LayoutUpdateConverter.php on line 19