Помгите с CodeIgniter

Выводит эту ошибку Too few arguments to function First::about(), 0 passed in /home/zalkar/Desktop/test/CI/system/core/CodeIgniter.php on line 532 and exactly 1 expected
что делать? Вот код:
<?php
defined('BASEPATH') OR exit('No direct script access allowed');

class First extends CI_Controller {
public function index()
{
$this->load->view('zk');
}

public function about($id){

$data['name'] = "Имя";
$data['surname'] = 'Фамилия';
$data['age'] = 18;
$this->load->view('about', $data);

if ($id = 1) {
echo "Privet";
}
}


}