Connect.conditionalGet error

node server.js

D:\node\Mobile-Chat-with-Sencha-Touch---node.js---socket.io-\server.js:13
Connect.conditionalGet(), // Add HTTP 304 responses to save even more
ndwid
^
TypeError: Object function createServer() {
function app(req, res){ app.handle(req, res); }
utils.merge(app, proto);
utils.merge(app, EventEmitter.prototype);
app.route = '/';
app.stack = [];
for (var i = 0; i < arguments.length; ++i) {
app.use(arguments[i]);
}
return app;
} has no method 'conditionalGet'
at Object. (D:\node\Mobile-Chat-with-Sencha-Touch---node.js---
ket.io-\server.js:13:10)
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:492:10)
at process.startup.processNextTick.process._tickCallback (node.js:244:9)