Integrating Microsoft Bot with Sharepoint using OAuth Node js

Im referring to the below link for integrating Microsoft Bot with sharepoint using OAuth node js

http://thecollaborationcorner.com/2017/01/25/search-for-your-sharepoint-content-from-a-bot-using-the-bot-framework-oauth2-and-node-js/#.WS5v5Ot96es

we are getting the below error. enter image description here once we click on the sign in button, we are getting the error.

Thanks Anu

via Anu Abaraham