Problem bei der Auflistung von Autorenartikeln

<?php get_header();?>
<br />
<div id="main">
<?php get_sidebar('left');?>
    <div id="content">
    <?php
    global $wp_query;
    $curauth = $wp_query->get_queried_object();
?>
<div class="post">
<h3>Autorenprofil <?php echo $curauth->nickname; ?></h3>
<div class="spalter2"> 
<p><img src="<?php bloginfo('stylesheet_directory');?>/img-autor/<?php echo $curauth->user_login; ?>-big.jpg" class="left" alt="Profilbild von <?php echo $curauth->nickname; ?>" title="Profilbild von <?php echo $curauth->nickname; ?>" /></p>
</div>
<br />
<div class="spalter2"> 
<ul>
<li><b>Name:</b><br /> <?php echo $curauth->first_name. ' ' . $curauth->last_name ;?></li>
<li><b>Webseite:</b><br /> <a href="<?php echo $curauth->user_url; ?>"><?php echo $curauth->user_url; ?></a></li>
<li><b>Details:</b><br /> <?php echo $curauth->description; ?></li>
</ul>
</div>
<div style="clear:both;"></div>


            <h3>Beitr&auml;ge von <?php echo $curauth->nickname; ?>:</h3>
            <ul class="authorposts">
            <!-- The Loop -->
            <?php if ( have_posts() ) : while ( have_posts() ) : the_post(); ?>
            <li>
                <em><?php the_time('j. F Y'); ?></em> |
                <a href="<?php the_permalink() ?>" rel="bookmark" title="Permanent Link: <?php the_title(); ?>"><?php the_title(); ?></a>
            </li>
            <?php endwhile; else: ?>
            <p><?php _e('Keine Beitr&auml;ge von diesem Autor.'); ?></p>


            <?php endif; ?>
            <!-- End Loop -->            
        </ul>
  
    </div>


<div class="text">
<?php if(function_exists('wp_page_numbers')) : wp_page_numbers(); endif; ?>
</div>
</div>
<?php get_sidebar('right');?>
<?php get_footer();?>