Node ACS remember me option when login

Hi.

I was trying to do an login option for my ACS web site so user can mark it and don't need to login each time he closes the browser. I did some searchs and found some close questions to this, but almost all was for mobile apps, no for Node ACS.

Well, what I tried till now was to login initially and save the data.meta.session_id into a cookie (with a week expiration time):

ACS.Users.login({
        // Get fields from form
        login: req.body.username,
        password: req.body.password
    }, function(data) {
        if (data.success) {
                // Set session data to be used later througout the app
                req.session.session_id = data.meta.session_id;
                res.cookie('session', req.session.session_id, {maxAge:60*60*24, httpOnly: true});
        } else { 
            res.redirect('/error?type=1');
        }
    });

Then, when the user closes the browser I still have the session alive in the cookie. When he comes back I do this:

if (req.cookies.session) {
        req.session.session_id = req.cookies.session;
}

Which seems valid, but now I need to access my user data and when I try this I get an error:

var ACS = require('acs').ACS;
        ACS.sessionId = req.cookies.session;
        ACS.Users.showMe(function (e) {
            if (e.success) {
                var user = e.users[0];
                console.log('Success:\n' +
                    'id: ' + user.id + '\n' +
                    'first name: ' + user.first_name + '\n' +
                    'last name: ' + user.last_name);
            } else {
                console.log('Error:\n' +
                    ((e.error && e.message) || JSON.stringify(e)));
            }
        });
 
Error: You need to sign in or sign up before continuing

How can I access my user data? Or this is not a valid method? Any other way to recover the user session to avoid continuosly login in?