Library creation problem!

[eluser]Joseph1982[/eluser]
Now it returns another error:

******************************************

A PHP Error was encountered

Severity: Notice

Message: Undefined property: User_authentication::$session

Filename: libraries/User_authentication.php

Line Number: 32

Fatal error: Call to a member function userdata() on a non-object in /system/application/libraries/User_authentication.php on line 32


On Line 32, I added a Session checking and is below:

Code:

if(!$this->session->userdata('logged_in'))

Actually I want to redirect to the home page, if the user doesn't logged in.. For that I checked inside the Session..