Error encountering NodeJS module

I'm following a book of NodeJS and it's giving the following error:

Error: Cannot find module './app/routes/home'

I have reviewed several times and found nothing wrong, here is the code:

Express.js

// config/express.js
var express = require('express');
var home = require('./app/routes/home');
module.exports = function () {
    var app = express();
    // variável de ambiente
    app.set('port', 3000);

    // middleware responsavel por tornar acessivel tudo dentro da pasta public, recebe como parametro a pasta public
    app.use(express.static('./public'));
    //No Express, template engines são confiurados em variáveis de ambiente
    //view engine utilizada é ejs.  
    app.set('view engine', 'ejs');
    //definimos o diretório onde fiarão nossas views
    app.set('views', './app/views');
    home(app);

    return app;
};

Route:

// app/routes/home.js

var controller = require('./app/controller/home');

module.exports = function (app) {
    app.get('/index', controller.index);
    app.get('/', controller.index);

}

Controller:

// app/controllers/home.js
module.exports = function () {
    var controller = {};
    controller.index = function (req, res) {
        res.render('index', { nome: 'Express' });
    };
    return controller;
}

And finally the server.js

// server.js
var http = require('http');
var app = require('./config/express')();
http.createServer(app).listen(app.get('port'), function () {
    console.log('Express Server escutando na porta ' +
        app.get('port'));
});

Where can I be wrong?

Directory structure :