TypeError: this.registerRoutes is not a function

[jurgob]

I get this errror.
Here's my code:

'use strict'

var express = require('express');
var mongoose = require('mongoose');
var app = express();
var MongoRest = require('mongo-rest')


let  userSchema = new mongoose.Schema({
  email: String,
  name: String,
  password: String,
  address: String,
  zipcode: Number,
  lists: Array
});

var mongoRest = new require('mongo-rest')(app, {
  urlRoot:"/"
});
mongoRest.addResource(userSchema);

app.listen(4000, function () {
  console.log('Example app listening on port 3000!');
});

I'm using node 5