I am learning node.js with express template engine, I am following udemy course learn node.js by building 10 projects, while following a lecture when professor run npm start localhost:3000 starts while mine pops up error indicating app.use requires middleware function
I have tried matching code and its same. Please help me to resolve the error i have been stuck here for hours tried a lot of edits but its not working for me.

When I am trying to run 'npm start' following error pops up

TypeError: app.use() requires middleware functions

Here is app.js code:

var express = require('express');

var path = require('path');

var favicon = require('serve-favicon');

var logger = require('morgan');

var expressValidator = require('express-validator');

var cookieParser = require('cookie-parser');

var session = require('express-session');

var passport = require('passport');

var LocalStrategy = require('passport-local').Strategy;

var bodyParser = require('body-parser');

var multer = require('multer');

var flash = require('connect-flash');

var mongo = require('mongodb');

var mongoose = require('mongoose');

var db = mongoose.connection;



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

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



var app = express();



// view engine setup

app.set('views', path.join(__dirname, 'views'));

app.set('view engine', 'jade');



//Handle File Uploads

app.use(multer({

  dest: './uploads'

}));



// uncomment after placing your favicon in /public

//app.use(favicon(__dirname + '/public/favicon.ico'));

app.use(logger('dev'));

app.use(bodyParser.json());

app.use(bodyParser.urlencoded({

  extended: false

}));



//Handle Express Sessions

app.use(session({

  secret: 'secret',

  saveUninitialied: true,

  resave: true

}));



//Passport

app.use(passport.initialize());

app.use(passport.session());



//Validator

app.use(expressValidator({

  errorFormatter: function(param, msg, value) {

    var namespace = param.split('.'),

      root = namespace.shift(),

      formParam = root;



    while (namespace.length) {

      formParam += '[' + namespace.shift() + ']';

    }

    return {

      param: formParam,

      msg: msg,

      value: value

    };

  }

}));



app.use(cookieParser());

app.use(express.static(path.join(__dirname, 'public')));



app.use(flash());



app.use(function(req, res, next) {

  res.locals.messages = require('express-messages')(req, res);

  next();

});



app.use('/', routes);

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



// catch 404 and forward to error handler

app.use(function(req, res, next) {

  var err = new Error('Not Found');

  err.status = 404;

  next(err);

});



// error handlers



// development error handler

// will print stacktrace

if (app.get('env') === 'development') {

  app.use(function(err, req, res, next) {

    res.status(err.status || 500);

    res.render('error', {

      message: err.message,

      error: err

    });

  });

}



// production error handler

// no stacktraces leaked to user

app.use(function(err, req, res, next) {

  res.status(err.status || 500);

  res.render('error', {

    message: err.message,

    error: {}

  });

});







module.exports = app;

Here is package.json file

{

  name: nodeauth,

  version: 1.0.0,

  private: true,

  scripts: {

    start: node ./bin/www

  },

  dependencies: {

    body-parser: ~1.12.4,

    cookie-parser: ~1.3.5,

    debug: ~2.2.0,

    express: ~4.12.4,

    jade: ~1.9.2,

    morgan: ~1.5.3,

    serve-favicon: ~2.2.1,

    mongodb: *,

    mongoose: *,

    connect-flash: *,

    express-validator: *,

    express-session: *,

    express-messages: *,

    passport: *,

    passport-local: *,

    passport-http: *,

    multer: *

  }

}

Here is updated app.js (after removing multar)

var express          = require('express'),

    path             = require('path'),

    favicon          = require('serve-favicon'),

    logger           = require('morgan'),

    cookieParser     = require('cookie-parser'),

    expressValidator = require('express-validator'),

    session          = require('express-session'),

    passport         = require('passport'),

    LocalStrategy    = require('passport-local').Strategy,

    bodyParser       = require('body-parser'),

    flash            = require('connect-flash'),

    mongo            = require('mongodb'),

    mongoose         = require('mongoose'),



    db = mongoose.connection,



    routes = require('./routes/index'),

    users  = require('./routes/users'),



    app = express();



// view engine setup

app.set('views', path.join(__dirname, 'views'));

app.set('view engine', 'jade');



// handle file uploads



//multer delted





// uncomment after placing your favicon in /public

//app.use(favicon(__dirname + '/public/favicon.ico'));

app.use(logger('dev'));

app.use(bodyParser.json());

app.use(bodyParser.urlencoded({ extended: false }));



// handle express sessions

app.use(session({

  secret: 'keyboard cat',

  resave: true,

  saveUninitialized: true

}));



// passport

app.use(passport.initialize());

app.use(passport.session());



// validator

app.use(expressValidator({

  errorFormatter: function(param, msg, value) {

    var namespace = param.split('.'),

        root      = namespace.shift(),

        formParam = root;



    while(namespace.length) {

      formParam += '[' + namespace.shift() + ']';

    }



    return {

      param: formParam,

      msg  : msg,

      value: value

    };

  }

}));



app.use(cookieParser());

app.use(express.static(path.join(__dirname, 'public')));



// flash

app.use(flash());



// express messages

app.use(function(req, res, next) {

  res.locals.messages = require('express-messages')(req, res);

  next();

});



app.get('*', function(req, res, next) {

  res.locals.user = req.user || null;

  next();

});



app.use('/', routes);

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



// catch 404 and forward to error handler

app.use(function(req, res, next) {

  var err = new Error('Not Found');

  err.status = 404;

  next(err);

});



// error handlers



// development error handler

// will print stacktrace

if (app.get('env') === 'development') {

  app.use(function(err, req, res, next) {

    res.status(err.status || 500);

    res.render('error', {

      message: err.message,

      error: err

    });

  });

}



// production error handler

// no stacktraces leaked to user

app.use(function(err, req, res, next) {

  res.status(err.status || 500);

  res.render('error', {

    message: err.message,

    error: {}

  });

});





//Express server

var http = require('http');

var server = http.createServer(app);



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

    res.send(Hello World!);

});



server.listen(3000, 'localhost');

server.on('listening', function() {

    console.log('Express server started on port %s at %s', server.address().port, server.address().address);

});



module.exports = app;

Thank You