Deploy Nodejs on Heroku fails serving static files located in subfolders

Question

I\'m deploying a NodeJs application using Heroku. Everything works fine except a little issue serving static files.

I have the following configuration

Answer 1

Finally I found the solution.

I solved that just adding the npm version in my package.json.

{
    "name": "bla",
    "version": "0.0.1",
    "dependencies": {
        "express": "3.2.6"
    },
    "engines": {
        "node": "0.10.11",
        "npm": "1.2.25"
    } 
}