TypeError：Object不是nodejs中的功能

Question

我通过nodejs进行用户身份验证。 TypeError：Oject不是像这样抛出错误的函数

user.js的

// get an instance of mongoose and mongoose.Schema
var mongoose = require('mongoose');
var Schema = mongoose.Schema;
// set up a mongoose model and pass it using module.exports
module.exports = mongoose.model('User', new Schema({
    name: String,
    password: String,
    admin: Boolean
}));

server.js

User = require('./models/user');
app.get('/setup', function (req, res) {
    // create a sample user
    var nick = new User({ // In this line throwing error Object is not a function.
        name: 'Nick Cerminara',
        password: 'password',
        admin: true
    });
    // save the sample user
    nick.save(function (err) {
        if (err) throw err;
        console.log('User saved successfully');
        res.json({
            success: true
        });
    });
});