Error when creating a Material request

Hi, we are using erpnext v13 beta v6 on ubuntu 18.04. When we are trying to create a material request, we got an error that is :-

Server Error

Close Report

AttributeError: ‘MaterialRequest’ object has no attribute ‘supplier_address’

And also, after selecting the supplier in reference field, an error occurs:-
Field plc_conversion_rate not found.

How can we resolve this? I am attaching some pictures for referance.