Can not find module

user.js

var mongoose = require('mongoose') var User = mongoose.model('User')

// signup exports.showSignup = function(req, res) { res.render('signup', { title: '注册页面' }) }

exports.showSignin = function(req, res) { res.render('signin', { title: '登录页面' }) } var User = require('../app/controllers/user') 提示找不到module user，user.js哪里写错了吗？