single.php is not working …

My site single.php of office theme is not working.WHERE IS THE MISTAKE?Anyone please check it and give me solutions.Thanks a lot for your help.

<?php get_header(); ?>

<div id=”whitewrap”>

<div class=”wrapper”>

<div id=”location”>
<p>/” title=”<?php bloginfo(‘name’); ?>”>Home / <?php the_category(‘ /’, ‘parents’ ); ?> / <?php the_title(”); ?></p>
</div>

<div id=”secondary”>

<?php if (have_posts()) : while (have_posts()) : the_post(); ?>

<div id=”postcontent”>

<?php the_content(”); ?>
</div>
<?php endwhile; else: ?>
<?php endif; ?>

<div id=”postcomments”>
<?php comments_template(); ?>
</div>

</div> <!– end secondary –>

<?php get_sidebar(); ?>

</div> <!– end wrapper –>

</div> <!– end whitewrap –>

<?php get_footer(); ?>

DHIRAJ.