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Error Adding to cart in Codeigniter shopping cart class
class Cart extends CI_Controller {

    public function __construct() {
        parent::__construct();
    $this->load->model('cart_model', 'cart_model', TRUE);
    $this->load->library('cart');
    }

    public function index() {
    echo $this->cart->total_items();
    }

    public function add(){
       $data = array(
               'id'      => 'ssksdu_123ABC',
               'qty'     => 3,
               'price'   => 39.95,
               'name'    => 'T-Shirt',
               'options' => array('Size' => 'L', 'Color' => 'Red')
       );
    $add = $this->cart->insert($data);
    if($add){
        redirect('cart');
    }
    }
}

$config['sess_cookie_name'] = 'ci_session';
$config['sess_expiration']  = 0;
$config['sess_expire_on_close'] = FALSE;
$config['sess_encrypt_cookie']  = TRUE;
$config['sess_use_database']    = TRUE;
$config['sess_table_name']  = 'ci_sessions';
$config['sess_match_ip']    = FALSE;
$config['sess_match_useragent'] = TRUE;
$config['sess_time_to_update']  = 300;