Link to Child Category not working

I have set up custom category templates naming the files “category-1.php” and so on. I am using the following code to pull the list of child categories and descriptions.

<?php
$categories = get_categories("title_li=&orderby=name&hide_empty=0&child_of=21");
foreach ((array) $categories as $cat) {
?>

<h2><a href="<?php echo get_category_link($cat->cat_ID); ?>" title="View all posts in <?php echo $cat->cat_name; ?>"><?echo $cat->cat_name; ?></a></h2>
<div style="border:1px #CCCCCC solid; margin:3px; padding:10px;">
<?php echo $cat->category_description; ?>
</div>
<?php } // end foreach loop ?>

When you click the child category link it takes you to a 404 page. Any help would be appreciated.