I am losing my head over this. If I try to make sales order it makes a request to get address_display and fails. This happens when I select customer. It is weird because that does not happen on Delivery Note or other customer related doctypes.
Hello 
,
Not able to understand the complete context, can you share some screenshot of browser console and some others to understand it better so we can help you to find the problem and provide solution to you
Hey @raj_007,
Thanks for trying to help. I figured it was something in customization of Sales Order, so the more time efficient thing was to just delete all customizations and start from scratch.