router.user require callback function

gistfile1.js

'use strict';

module.exports = function(app) {
    /*
     * resources
     */
    app.use(require('./zip')(app));
};

gistfile2.txt

vagrant@zipper:/var/www/zipper$ node runserver.js

/var/www/zipper/node_modules/express/lib/router/index.js:416
    throw new TypeError('Router.use() requires callback function');
          ^
TypeError: Router.use() requires callback function
    at Function.use (/var/www/zipper/node_modules/express/lib/router/index.js:416:11)
    at Function.use (/var/www/zipper/node_modules/express/lib/application.js:193:14)
    at module.exports (/var/www/zipper/kernel/api/v1/index.js:7:9)
    at module.exports (/var/www/zipper/kernel/api/index.js:41:41)
    at Object.<anonymous> (/var/www/zipper/app.js:9:32)
    at Module._compile (module.js:456:26)
    at Object.Module._extensions..js (module.js:474:10)
    at Module.load (module.js:356:32)
    at Function.Module._load (module.js:312:12)
    at Module.require (module.js:364:17)

zip.js

'use strict';

var request = require('request'),
    async = require('async'),
    util = require('util'),
    fs = require('fs'),
    https = require('https'),
    http = require('http'),
    hash = require('object-hash'),
    pkgcloud = require('pkgcloud'),
    config = require('../../../config'),
    session = require('../../../lib/session'),
    archiver = require('archiver'),
    formatterManager = require('../../../lib/formatter'),
    settingsManager = require('../../../lib/settings'),
    zipManager = require('../../../lib/zip/manager');

module.exports = function(app) {
    /**
     * POST /zip - preparing archive token for easy downloading from browser (/GET method)
     */
    app.post(
        '/zip',
        require('../../../middleware/validator/zip').Create,
        require('../../../middleware/validator/response/api'),
        postZipHandler,
        require('../../../middleware/http/response/json')
    );
};

/**
 * @param {Request} req
 * @param {Response} res
 * @param {Function} next
 */
function postZipHandler(req, res, next) {
    zipManager.switchStorageDb(10);

    res.locals.archiveHashString = hash(req.body);

    // store data & set expiration time
    zipManager.saveArchiveData(
        formatterManager.get('redis.key').format([
            session.getClient(),
            session.getProvider(),
            'archive',
            res.locals.archiveHashString
        ]),
        req.body,
        60 * 60 * 24 * 30
    );

    next();
}