throw new TypeError('Router.use() requires middleware function but got a
  ^
 TypeError: Router.use() requires middleware function but got a Object

/Users/datis/Documents/bb-dashboard/node_modules/express/lib/router/index.js:438
  throw new TypeError('Router.use() requires middleware function but got a
  ^
 TypeError: Router.use() requires middleware function but got a Object
  at /Users/datis/Documents/bb-dashboard/node_modules/express/lib/router/index.js:438:13
  at Array.forEach (native)
  at Function.use (/Users/datis/Documents/bb-dashboard/node_modules/express/lib/router/index.js:436:13)
  at /Users/datis/Documents/bb-dashboard/node_modules/express/lib/application.js:188:21
  at Array.forEach (native)
  at Function.use (/Users/datis/Documents/bb-dashboard/node_modules/express/lib/application.js:185:7)
  at Object.<anonymous> (/Users/datis/Documents/bb-dashboard/app.js:46:5)
  at Module._compile (module.js:456:26)
  at Object.Module._extensions..js (module.js:474:10)
  at Module.load (module.js:356:32)

 var express = require('express');
 var path = require('path');
 var favicon = require('serve-favicon');
 var logger = require('morgan');
 var cookieParser = require('cookie-parser');
 var bodyParser = require('body-parser');
 var mongoose = require('mongoose');
 var session = require('express-session');
 var MongoClient = require('mongodb').MongoClient;
 var routes = require('./routes/index');
 var users = require('./routes/users');
 
 var Users = require('./models/user');
 var Items = require('./models/item');
 var Store = require('./models/store');
 var StoreItem = require('./models/storeitem');
 
 var app = express();
 //set mongo db connection
 var db = mongoose.connection; 
 
 MongoClient.connect("mongodb://localhost:27017/test", function(err, db) {
  if(!err) {
  console.log("We are connected");
  }
 });
 // var MONGOHQ_URL="mongodb://localhost:27017/test" 
 
 // view engine setup
 app.set('views', path.join(__dirname, 'views'));
 
 app.set('view engine', 'ejs');
 
 // 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 }));
 app.use(cookieParser());
 app.use(session({
  secret: 'something',
  resave: true,
  saveUninitialized: true
 }));
 
 app.use('/', routes);
 app.use('/users', users);
 app.use(express.static(path.join(__dirname, 'public')));
 
 // catch 404 and forward to error handler
 // app.use(function(req, res, next) {
 // var err = new Error('Not Found');
 // err.status = 404;
 // next(err);
 // });
 
 // Make our db accessible to our router
 app.use(function(req, res, next){
  req.db = db;
  next();
 });
 
 // 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;