Node.Js Application on Heroku

Hello, I am trying to put a simple node.js application on heroku cloud to access it from anywhere.
I want to put etherpad lite on heroku but I cant seem to make it work.
the tutorial is pretty simple and can be completed in 5 minutes:

but the problem is I cannot run the application it gives me H10 error. I have been seeing tutorials for this error for many days but I cannot find a solution. can anyone please help me on this?
this is the error i get