Hi, I was also facing the same error. 

Go to Inventory > Configurations > Operations Types > Delivery Orders.

In Delivery orders you have to select the destination location as Partner/Customer.

I hope this solves the problem.

Hi,

This error occurs when a necessary field is left blank when creating or editing a record in Odoo.

In your situation, you need to provide a value for the field named location_dest_id.

For additional details, please refer to:

 https://www.youtube.com/watch?v=mA_OojjUP0I

Hope it helps