CI 2.1.1 documentation The page you requested was not found - php

Question

I Have following step by step the documentation in news section. In news, CI can open data from database. in database there are 2 data like this
Put news data from database
In there, there is view article link. but after click the link, CI open error 404 like this
News Item from View article
can help me to solve the problem? i'm sorry my english is bad
News_model.php
<?php
class News_model extends CI_Model {
public function __construct()
{
$this->load->database();
}
public function get_news($slug = FALSE)
{
if ($slug === FALSE)
{
$query = $this->db->get('news');
return $query->result_array();
}
$query = $this->db->get_where('news', array('slug' => $slug));
return $query->row_array();
}
}
Controller (News.php)
<?php
class News extends CI_Controller {
public function __construct()
{
parent::__construct();
$this->load->model('news_model');
}
public function index()
{
$data['news'] = $this->news_model->get_news();
$data['title'] = 'News archive';
$this->load->view('templates/header', $data);
$this->load->view('news/index', $data);
$this->load->view('templates/footer');
}
public function view($slug)
{
$data['news'] = $this->news_model->get_news($slug);
if (empty($data['news_item']))
{
show_404();
}
$data['title'] = $data['news_item']['title'];
$this->load->view('templates/header', $data);
$this->load->view('news/view', $data);
$this->load->view('templates/footer');
}
}
Index.php in news View
<?php foreach ($news as $news_item): ?>
<h2><?php echo $news_item['title'] ?></h2>
<div id="main">
<?php echo $news_item['text'] ?>
</div>
<p>View article</p>
<?php endforeach ?>
view.php in view
<?php
echo '<h2>'.$news_item['title'].'</h2>';
echo $news_item['text'];

Answer 1

You haven't completed the "Routing" section at the end of that tutorial.
Also, don't start learning with CodeIgniter 2.x - it's no longer supported - go for version 3 instead.