Node.jsのmulterとExpressで画像をアップロードするとMulterError: Unexpected fieldとエラーがでる。

前提・実現したいこと

Node.jsのモジュールのmulterとExpress使用して画像をアップロードし、画像をuploadディレクトリに保存しようとしたのですが、以下のようなエラーが出ています。

発生している問題・エラーメッセージ

Unexpected field
MulterError: Unexpected field
    at wrappedFileFilter (/home/vagrant/workspace/test/node_modules/multer/index.js:40:19)
    at Busboy.<anonymous> (/home/vagrant/workspace/test/node_modules/multer/lib/make-middleware.js:114:7)
    at Busboy.emit (events.js:182:13)
    at Busboy.emit (/home/vagrant/workspace/test/node_modules/busboy/lib/main.js:38:33)
    at PartStream.<anonymous> (/home/vagrant/workspace/test/node_modules/busboy/lib/types/multipart.js:213:13)
    at PartStream.emit (events.js:182:13)
    at HeaderParser.<anonymous> (/home/vagrant/workspace/test/node_modules/dicer/lib/Dicer.js:51:16)
    at HeaderParser.emit (events.js:182:13)
    at HeaderParser._finish (/home/vagrant/workspace/test/node_modules/dicer/lib/HeaderParser.js:68:8)
    at SBMH.<anonymous> (/home/vagrant/workspace/test/node_modules/dicer/lib/HeaderParser.js:40:12)
    at SBMH.emit (events.js:182:13)
    at SBMH._sbmh_feed (/home/vagrant/workspace/test/node_modules/streamsearch/lib/sbmh.js:159:14)
    at SBMH.push (/home/vagrant/workspace/test/node_modules/streamsearch/lib/sbmh.js:56:14)
    at HeaderParser.push (/home/vagrant/workspace/test/node_modules/dicer/lib/HeaderParser.js:46:19)
    at Dicer._oninfo (/home/vagrant/workspace/test/node_modules/dicer/lib/Dicer.js:197:25)
    at SBMH.<anonymous> (/home/vagrant/workspace/test/node_modules/dicer/lib/Dicer.js:127:10)
    at SBMH.emit (events.js:182:13)
    at SBMH._sbmh_feed (/home/vagrant/workspace/test/node_modules/streamsearch/lib/sbmh.js:188:10)
    at SBMH.push (/home/vagrant/workspace/test/node_modules/streamsearch/lib/sbmh.js:56:14)
    at Dicer._write (/home/vagrant/workspace/test/node_modules/dicer/lib/Dicer.js:109:17)
    at doWrite (_stream_writable.js:410:12)
    at writeOrBuffer (_stream_writable.js:394:5)

upload.js

var express = require('express');
var router = express.Router();
var multer = require('multer');


var storage = multer.diskStorage({
  destination: function (req, file, cb) {
    cb(null, './upload')
  },
  filename: function (req, file, cb) {
    cb(null, file.originalname)
  }
})

var upload = multer({ storage: storage });

router.post('/', upload.single('fileimage'), function(req, res){
  console.log(req.file);
});


module.exports = router;

user.pug

extends layout

block content

  form(method='POST', enctype='multipart/form-data', action='/upload')
    input(type='file', name='fileimage')
    input(type='submit')

user.js

var express = require('express');
var router = express.Router();


router.get('/', function(req, res, next) {
  res.render('user',
  {

  });

});

module.exports = router;

###app.js

var createError = require('http-errors');
var express = require('express');
var path = require('path');
var cookieParser = require('cookie-parser');
var logger = require('morgan');

var indexRouter = require('./routes/index');
var uploadRouter = require('./routes/upload');
var userRouter = require('./routes/user');

var app = express();

// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'pug');

app.use(logger('dev'));
app.use(express.json());
app.use(express.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));

app.use('/', indexRouter);
app.use('/upload', uploadRouter);
app.use('/user', userRouter)

// catch 404 and forward to error handler
app.use(function(req, res, next) {
  next(createError(404));
});

// error handler
app.use(function(err, req, res, next) {
  // set locals, only providing error in development
  res.locals.message = err.message;
  res.locals.error = req.app.get('env') === 'development' ? err : {};

  // render the error page
  res.status(err.status || 500);
  res.render('error');
});

module.exports = app;

試したこと

この方法では画像が保存できました。
しかし保存する時にファイル名を変えたいのでupload.jsの方法を使いたいです。

var express = require('express');
var router = express.Router();
var multer = require('multer');
var upload = multer({ dest: './upload/'}).single('fileimage');

router.post('/', function(req, res){
  upload(req, res, function(err){
    res.send("uploaded" + req.file.destination);
  })
})


module.exports = router;