我正在使用位于此处的教程：http : //addyosmani.github.io/backbone-fundamentals/#create-
a-simple-web-server并添加了以下代码。

// Module dependencies.
var application_root = __dirname,
express = require( 'express' ), //Web framework
path = require( 'path' ), //Utilities for dealing with file paths
mongoose = require( 'mongoose' ); //MongoDB integration

//Create server
var app = express();

// Configure server
app.configure( function() {
//parses request body and populates request.body
app.use( express.bodyParser() );

//checks request.body for HTTP method overrides
app.use( express.methodOverride() );

//perform route lookup based on url and HTTP method
app.use( app.router );

//Where to serve static content
app.use( express.static( path.join( application_root, 'site') ) );

//Show all errors in development
app.use( express.errorHandler({ dumpExceptions: true, showStack: true }));
});

//Start server
var port = 5000;
app.listen( port, function() {
console.log( 'Express server listening on port %d in %s mode', port, app.settings.env );
});

在启动服务器后，node server.js我收到一条错误消息，指出Cannot GET /访问时的错误localhost:5000，我只是想知道是否有人对这个错误了解很多，因为Express和Node对我来说是新的？