express.js require configuration

I'm having trouble requiring a configuration file in a node/express application I'm starting for learning purposes:

structure

app.js
-/config/environment.js
-/views
-/public

app.js

var express = require('express');
var app = express();
var config = require('./config/enviroment')(app, express);

environment.js

module.exports = function(app, express) {
app.configure(function() {
    app.use(express.logger());
    app.use(express.static(__dirname + '/public'));
    app.set('views', __dirname + '/views');
    app.set('view engine', 'jade'); //extension of views
});

error

Error: Cannot find module './config/enviroment'

stack

• node v0.10.0
• npm v1.2.14
• express.js 3.x

Sorry for asking such a simple question - it seems like it should work. I've checked file/directory permissions - everything seems in order. I'm able to serve views etc. from adjacent folders when I move the view configuration into app.js - so I don't think it's a permissions issue.