Using cookie-session with express.io

[khalilTN]

I'm trying to use _cookie-session_ with _express.io_ and so avoid using _MemoryStore_

This is my code :

express = require('express.io');
app = express().http().io();
require('express.io-middleware')(app);
app.use(express.cookieParser());
var session = require('cookie-session');
app.use(express.session({secret: 'hygdfreiliu'}));
app.io.use(function(req, next) {
    if (req.session.user || (req.io.event === "user:login")) {
        try {
            next();
        }
        catch(err){
            __debug.error('REQUEST_ERROR');
            var result = new (require("./core/result.js"))();
            result.notification.error("#REQUEST_ERROR");
            req.io.respond(result);
        }
    }
});

An exception occurs:

TypeError: object is not a function
    at /home/dev/svn/webmail2/node_modules/express.io/compiled/index.js:107:20
    at iterate (/home/dev/svn/webmail2/node_modules/express.io/node_modules/async/lib/async.js:108:13)
    at Object.async.forEachSeries (/home/dev/svn/webmail2/node_modules/express.io/node_modules/async/lib/async.js:124:9)
    at Manager.<anonymous> (/home/dev/svn/webmail2/node_modules/express.io/compiled/index.js:106:24)
    at Manager.authorize (/home/dev/svn/webmail2/node_modules/express.io/node_modules/socket.io/lib/manager.js:925:31)
    at Manager.handleHandshake (/home/dev/svn/webmail2/node_modules/express.io/node_modules/socket.io/lib/manager.js:801:8)
    at Manager.handleRequest (/home/dev/svn/webmail2/node_modules/express.io/node_modules/socket.io/lib/manager.js:616:12)
    at Server.<anonymous> (/home/dev/svn/webmail2/node_modules/express.io/node_modules/socket.io/lib/manager.js:119:10)
    at Server.emit (events.js:98:17)
    at HTTPParser.parser.onIncoming (http.js:2108:12)

How can i avoid this problem, is there another way to avoid using _MemoryStore_ besides using another database like _mongo_ or _redis_ ?