Unable to locate the specified class: Session.php [SOLVED]

PHP Code:

<?php 

class Facebook extends CI_Controller
{
    public function __construct()
    {
        parent::__construct();
        $this->load->library('session');
    }

        /**
     * Callback to log with facebook account
     */
    public function login_callback()
    {
        if ($this->facebook->fb_callback()) {
            redirect('home');
        } else {
            show_error('erreur');
        }
    }
    
    /**
     * Callback to disconnect the facebook acount
     */
    public function disconnectFacebookAccount_callback()
    {
        $this->facebook->disconnectFacebookAccount();
        redirect('Welcome_fb_ion_auth');
    }
    
    /**
     * Callback to connect the user's facebook acount
     */
    public function register_callback()
    {
        $this->facebook->connectFacebookAccount();
        redirect('my-info');
    }
    

}

PHP Code:

*
| -------------------------------------------------------------------
|  Auto-load Packages
| -------------------------------------------------------------------
| Prototype:
|
|  $autoload['packages'] = array(APPPATH.'third_party', '/usr/local/shared');
|
*/
$autoload['packages'] = array();

/*
| -------------------------------------------------------------------
|  Auto-load Libraries
| -------------------------------------------------------------------
| These are the classes located in system/libraries/ or your
| application/libraries/ directory, with the addition of the
| 'database' library, which is somewhat of a special case.
|
| Prototype:
|
|    $autoload['libraries'] = array('database', 'email', 'session');
|
| You can also supply an alternative library name to be assigned
| in the controller:
|
|    $autoload['libraries'] = array('user_agent' => 'ua');
*/
$autoload['libraries'] = array('template', 'ion_auth', 'database', 'form_validation', 'facebook', 'session');

/*
| -------------------------------------------------------------------
|  Auto-load Drivers
| -------------------------------------------------------------------
| These classes are located in system/libraries/ or in your
| application/libraries/ directory, but are also placed inside their
| own subdirectory and they extend the CI_Driver_Library class. They
| offer multiple interchangeable driver options.
|
| Prototype:
|
|    $autoload['drivers'] = array('cache');
|
| You can also supply an alternative property name to be assigned in
| the controller:
|
|    $autoload['drivers'] = array('cache' => 'cch');
|
*/
$autoload['drivers'] = array();

/*
| -------------------------------------------------------------------
|  Auto-load Helper Files
| -------------------------------------------------------------------
| Prototype:
|
|    $autoload['helper'] = array('url', 'file');
*/
$autoload['helper'] = array('url', 'facebook_helper');

/*
| -------------------------------------------------------------------
|  Auto-load Config files
| -------------------------------------------------------------------
| Prototype:
|
|    $autoload['config'] = array('config1', 'config2');
|
| NOTE: This item is intended for use ONLY if you have created custom
| config files.  Otherwise, leave it blank.
|
*/
$autoload['config'] = array();

/*
| -------------------------------------------------------------------
|  Auto-load Language files
| -------------------------------------------------------------------
| Prototype:
|
|    $autoload['language'] = array('lang1', 'lang2');
|
| NOTE: Do not include the "_lang" part of your file.  For example
| "codeigniter_lang.php" would be referenced as array('codeigniter');
|
*/
$autoload['language'] = array();