node.js - Error: Cannot GET / -

i working in c9.io ide environment, have written below code in server.js file

var http = require('http'); var path = require('path');  var async = require('async'); var socketio = require('socket.io'); var express = require('express');  var express = require('express'); var app = express();  var router = express(); var server = http.createserver(router);  server.listen(process.env.port || 3000, process.env.ip || "0.0.0.0", function(){   var addr = server.address();   console.log("server listening at", addr.address + ":" + addr.port); });  app.use(express.static(__dirname + '/client'));  // respond "hello world" when request made homepage app.get('/', function(req, res) {   res.render('index.html'); });  app.get('/about', function (req, res) {   res.send('about'); }); 

after running node server.js in terminal message given

your code running @ https://nodejs2-mujaffar.c9.io. important: use process.env.port port , process.env.ip host in scripts!  server listening @ 0.0.0.0:8080 

but after accessing https://nodejs2-mujaffar.c9.io/ url -- not rendering view displaying message error: cannot /

what doing wrong?

please help.

you seem have created 2 instances of express may problem.

try changing:

var express = require('express'); var app = express();  var router = express(); var server = http.createserver(router); 

to:

var express = require('express'); var app = express();  var server = http.createserver(app); 

at minute, express app variable not bound http server. have instead bounded unused instance called router. have registered routes app variable.