JavaScript TypeError mit node.js Modul 'http-auth'

// HTTP module.
var http = require('http');

// HTTP proxy module.
var httpProxy = require('http-proxy');

// Authentication module.
var auth = require('../lib/http-auth');
var basic = auth.basic({
	realm: "Simon Area.",
	file: __dirname + "/../data/users.htpasswd" // gevorg:gpass, Sarah:testpass ...
});

// Create your proxy server.
httpProxy.createServer(basic, 1338, "127.0.0.1").listen(1337);

// Create your target server.
http.createServer(function (req, res) {
	res.end("Request successfully proxied!");
}).listen(1338);

C:\Users\tester\node_modules\http-auth\lib\server\proxy.coffee:19
      oldProxyRequest = server.proxy.proxyRequest;
                                    ^
TypeError: Cannot read property 'proxyRequest' of undefined
    at Function.httpProxy.createServer (C:\Users\tester\node_modules\http-auth\lib\server\proxy.coffee:19:37)
    at startHttpProxyWithAuthentication (C:\Users\tester\Documents\Aptana Studio 3 Workspace\Proxy\proxy.js:70:12)
    at Object.<anonymous> (C:\Users\christian_blechert\Documents\Aptana Studio 3 Workspace\Proxy\proxy.js:101:4)
    at Module._compile (module.js:456:26)
    at Object.Module._extensions..js (module.js:474:10)
    at Module.load (module.js:356:32)
    at Function.Module._load (module.js:312:12)
    at Function.Module.runMain (module.js:497:10)
    at startup (node.js:119:16)
    at node.js:906:3