I am attempting to run Nodejs with the Socket.io module. I have installed the latest version of Nodejs, and I installed socket.io from a command prompt opened as an administrator (I'm in windows 7) using the command Npm Install socket.io The install appears to complete without any problems but when I attempt to run the following test program:

var io = require('socket.io').listen(80);

io.sockets.on('connection', function (socket) {
  socket.emit('news', { hello: 'world' });
  socket.on('my other event', function (data) {
    console.log(data);
  });
});

I receive this error:

module.js:340
    throw err;
Error: Cannot find module 'socket.io'
    at Function.Module._resolveFilename (module.js:338:15)
    at Function.Module._load (module.js:280:25)
    at Module.require (module.js:362:17)
    at require (module.js:378:17)
    at Object. (C:\xampp\htdocks\HTML5Game\impact\app.js:1:72)
    at Module._compile (module.js:449:26)
    at Object.Module._extensions..js (module.js:467:10)
    at Module.load (module.js:356:32)
    at Function .Module._load (module.js:312:12)
    at Module.runMain (module.js:487:10)

In my searching I found some things about dependency problems, and some suggestions about incompatibility between socket.io and a version of Nodejs, but both were talking about older versions of socket.io and Node Thanks.

cd app
rm -rf node_modules
npm cache clean
npm install

Explanation

cd app

Go to your app directory

rm -rf node_modules

Delete your currently installed modules

npm cache clean

Delete your npm cache, (some errors are caused by this)

npm install

Install modules listed in your package.json. If you don't have a package.json, you can install a specific module like this

npm install 

Example

npm install socket.io

In your case, if you don't know what a package.json is, please read up on it here before continuing to work on nodejs.