Comment réparer "Erreur: écouter EADDRINUSE: adresse déjà utilisée ::: 5000" Événement 'erreur' non géré

Je crée un serveur nodejs (une loginapp) mais quand j'essaye de node app une erreur (elle n'était pas là avant) est sortie:

var mongoose = require('mongoose');
var bcrypt = require('bcryptjs');

// USER SCHEMA
var UserSchema = mongoose.Schema({
    username: {
        type: String,
        index: true
    },
    name: {
        type: String
    },
    email: {
        type: String
    },
    password: {
        type: String
    }
});

var User = module.exports = mongoose.model('User', UserSchema);

module.exports.createUser = function(newUser, callback) {
    bcrypt.genSalt(10, function(err, salt) {
        bcrypt.hash(newUser.password, salt, function(err, hash) {
            newUser.password = hash;
            newUser.save(callback);
        });
    });
}

Je pense qu'il y a un lien avec mongo mais je n'ai pas vu l'erreur,

Ceci est mon code app.js (NON COMPLET) me demande si vous avez besoin de plus de mon code

var express = require('express');
var router = express.Router();
var bodyParser = require('body-parser');

var User = require('../models/user');

// REGISTER
router.get('/register', (req, res) => {
    res.render('register');
});

// LOGIN
router.get('/login', (req, res) => {
    res.render('login');
});

// REGISTER
router.post('/register', (req, res) => {
    var name = req.body.name;
    var username = req.body.username;
    var email = req.body.email;
    var password = req.body.password;
    var password2 = req.body.password2;

    // VALIDATION
    req.checkBody('name','Name is required').notEmpty();
    req.checkBody('username','Username is required').notEmpty();
    req.checkBody('email','Email is required').notEmpty();
    req.checkBody('email','Email is not valid').isEmail();
    req.checkBody('password','Password is required').notEmpty();
    req.checkBody('password2','Passwords do not match').equals(req.body.password);

    var errors = req.validationErrors();

    if(errors) {
        res.render('register', {
            errors:errors
        });
    } else {
        var newUser = new User({
            name: name,
            username: username,
            email: email,
            password: password
        });

        User.createUser(newUser, function(err, user) {
            if(err) throw err;
            console.log(user);
        });

        req.flash('success_msg', 'You are now registered and u can log');

        res.redirect('/users/login');
    }
});

module.exports = router;

Ceci est mon fichier users.js

var express = require('express');
var path = require('path');
var cookieParser = require('cookie-parser');
var exphbs = require('express-handlebars');
var expressValidator = require('express-validator');
var bodyParser = require('body-parser');
var flash = require('connect-flash');
var session = require('express-session');
var passport = require('passport');
var LocalStrategy = require('passport-local'),Strategy;
var mongo = require('mongodb');
var mongoose = require('mongoose');
mongoose.connect('mongodb://localhost/loginapp', { useNewUrlParser: true });
var db = mongoose.connection;

var routes = require('./routes/index');
var users = require('./routes/users');

// APP INIT
var app = express();

// VIEW ENGINE
app.set('views', path.join(__dirname,'views'));
app.engine('handlebars', exphbs({ defaultLayout:'layout' }));
app.set('view engine','handlebars');

app.use('/', routes);
app.use('/users', users);

// SET PORT
app.set('port', (5000));

app.listen(app.get('port'), () => {
    console.log('Server lancé sur le port ' + app.get('port'));
});

Et le fichier user.js

events.js:167
      throw er; // Unhandled 'error' event
      ^

Error: listen EADDRINUSE: address already in use :::5000
    at Server.setupListenHandle [as _listen2] (net.js:1290:14)
    at listenInCluster (net.js:1338:12)
    at Server.listen (net.js:1425:7)
    at Function.listen (C:\Users\Corentin\Documents\loginapp\node_modules\express\lib\application.js:618:24)
    at Object.<anonymous> (C:\Users\Corentin\Documents\loginapp\app.js:81:5)
    at Module._compile (internal/modules/cjs/loader.js:689:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:700:10)
    at Module.load (internal/modules/cjs/loader.js:599:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:538:12)
    at Function.Module._load (internal/modules/cjs/loader.js:530:3)
    at Function.Module.runMain (internal/modules/cjs/loader.js:742:12)
    at startup (internal/bootstrap/node.js:283:19)
    at bootstrapNodeJSCore (internal/bootstrap/node.js:743:3)
Emitted 'error' event at:
    at emitErrorNT (net.js:1317:8)
    at process._tickCallback (internal/process/next_tick.js:63:19)
    at Function.Module.runMain (internal/modules/cjs/loader.js:745:11)
    at startup (internal/bootstrap/node.js:283:19)
    at bootstrapNodeJSCore (internal/bootstrap/node.js:743:3)

Merci beaucoup à la personne qui peut aidez-moi!