Fatal error: Uncaught Error: Call to a member function getChildHtml() on null in /home/esecureh/public_html/magdemo/vendor/magento/module-sales/view/adminhtml/templates/order/totals/main.phtml:8 Stack trace: #0 {main} thrown in /home/esecureh/public_html/magdemo/vendor/magento/module-sales/view/adminhtml/templates/order/totals/main.phtml on line 8