Fatal error: Uncaught Error: Call to a member function getForm() on null in /home/esecureh/public_html/magdemo/vendor/magento/module-customer/view/adminhtml/templates/tab/newsletter.phtml:9 Stack trace: #0 {main} thrown in /home/esecureh/public_html/magdemo/vendor/magento/module-customer/view/adminhtml/templates/tab/newsletter.phtml on line 9