socket.io.js not found

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Please check your Express version. Express recently is updated to 3.0alpha which API was changed. If 3.0 you can change your code to something likes this:

var express = require('express')
  , http = require('http');

var app = express();
var server = http.createServer(app);
var io = require('socket.io').listen(server);

...

server.listen(8000);

Same issue with connect: https://github.com/senchalabs/connect/issues/500#issuecomment-4620773

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