Following news section tutorial - 404 Page Not Found

Hi

I am new to php and have just recently downloaded CodeIgniter and am following the tutorial for the news section. The problem I am encountering is with the following code from the news overview page index.php here application/views/news/index.php.

Code:

    <p>
      <a href="<?php echo $news_item['slug'] ?>">View article</a>
    </p>

It get the 404 Page Not Found error (details showing in URL is http://localhost/CodeIgniter/index.php/t...field_slug)

But when I put in this code, it displays the data from $news_item['slug'] Ok

Code:

    <!-- test div -->
    <div>
        <?php echo $news_item['slug'] ?>
    </div>

I have gone back and checked all my code against that in the tutorial and this is not the problem. Has anyone else encountered this problem?