issue in using Adoxio Connect Framework.

Hi

I am creating an Web App with Adoxio Connect Framework. 

I am referring below link: 

http://colinvermander.com/2017/03/29/building-a-dynamics-365-asp-net-web-app-with-adoxio-connect-framework/

But I am getting below error:

The Http request is unauthorized with client authentication scheme "Anonymous."