What is the error? The express-session deprecated warning is not an error and does not stop the app. To eliminate the warning, follow the answers from this thread.

https://stackoverflow.com/questions/28839532/node-js-session-error-express-session-deprecated/34744627

If this not stop the app then why app not show next anything just stop here

Any issue in it?

If I hit from broswer then show error.

Hi @Benny Dadon I was able to successfully follow the RingCentral tutorial and build this app. I packaged this demo into a simple node.js app. You can clone and run it, just follow the steps as described in the README. Demo App: https://github.com/suyashjoshi/ringcentral-js-auth