ErkanaAuth: A non-invasive user authentication library

[eluser]cosmik_roger[/eluser]
Hello, I got a problem that I can't resolve, so I ask for your help:
This library works fine with cookie, but with session, when executing the function try_session_login(), it seems that $this->CI->session->userdata('user_id') can't retrieve data.
I changed the name of the session and users table, but as it works fine with the try_login() function (i made an echo of $this->CI->session->userdata('user_id') and it is well created.
You can check Erkana library's file of my project here : http://robby.homelinux.net/jdllbeauvais/...naauth.php
and the controller here : http://robby.homelinux.net/jdllbeauvais/.../admin.php

thanks for your attention