Hello I am new in NodeJs and I have been following this tutorial http://code.tutsplus.com/tutorials/authenticating-nodejs-applications-with-passport--cms-21619 to create a app with authenticating.
I tried to follow all the structre and code from the tutorial (code is on github https://github.com/tutsplus/passport-mongo) but when I open my app in browser
i get error this error

TypeError: passport.authenticate is not a function
at module.exports (C:myApproutesindex.js:24:34)

This is my index.js route file

var express = require('express');

var router = express.Router();

var passport = require('passport');



var isAuthenticated = function (req, res, next) {

  // if user is authenticated in the session, call the next() to call the next request handler

  // Passport adds this method to request object. A middleware is allowed to add properties to

  // request and response objects

  if (req.isAuthenticated())

    return next();

  // if the user is not authenticated then redirect him to the login page

  res.redirect('/');

}



module.exports = function(passport){



  /* GET login page. */

  router.get('/', function(req, res) {

    // Display the Login page with any flash message, if any

    res.render('index', { message: req.flash('message') });

  });



  /* Handle Login POST */

  router.post('/login', passport.authenticate('login', {

    successRedirect: '/home',

    failureRedirect: '/',

    failureFlash : true

  }));



  /* GET Registration Page */

  router.get('/signup', function(req, res){

    res.render('register',{message: req.flash('message')});

  });



  /* Handle Registration POST */

  router.post('/signup', passport.authenticate('signup', {

    successRedirect: '/home',

    failureRedirect: '/signup',

    failureFlash : true

  }));



  /* GET Home Page */

  router.get('/home', isAuthenticated, function(req, res){

    res.render('home', { user: req.user });

  });



  /* Handle Logout */

  router.get('/signout', function(req, res) {

    req.logout();

    res.redirect('/');

  });



  return router;

}

Probabbly the problem is there, maybe routing was change in some version of express, but I cant figure out what is the problem.
Can you help pme please ?