Comments not showing in my developed theme

Hi,

I’m not able to view the approved comments in articles in the theme I’m developing.

I use this code :

<div id="comments">
        <ol class="commentlist">
          <?php wp_list_comments(); ?>
        </ol>
             <?php comment_form(); ?>
      </div>

I can see the area for inserting the comment, and I can actually insert it, but I cant see the comment once is approved.

Am I doing something wrong ?