Autorenprofile wird nicht angezeigt

<?php
/*
Template Name: Authors
*/
?>
<?php get_header(); ?>
<div id="content" class="narrowcolumn"> <!-- This sets the $curauth variable --> <?php if(isset($_GET['author_name'])) : $curauth = get_userdatabylogin($author_name); else : $curauth = get_userdata(intval($author)); endif; ?>
 <h2 class="center">Autorenprofil von <?php echo $curauth->nickname; ?></h2> 
 <div id="content">
 <div id="content-left">
<?php if (have_posts()) : ?>
  <?php while (have_posts()) : the_post(); ?>
 
   <div class="box-left" id="post-<?php the_ID(); ?>">
   
    <h3><a href="<?php the_permalink(); ?>" rel="bookmark" title="<?php the_title(); ?>"><?php the_title(); ?></a></h3>
    
    <?php the_content(); ?>
   <div class="clear"></div></div>
  
  <?php endwhile; ?>
  
  <?php else : ?>
  <div class="box-left">
   <h3>Not found!</h3>
   <p><?php _e('Sorry, no posts matched your criteria.'); ?></p>
   <?php include (TEMPLATEPATH . "/searchform.php"); ?>
  
  </div>
<?php endif; ?>
 
   </div><!-- end content-left -->
   
   <?php get_sidebar(); ?>
   
   <div class="clear"></div>
 
</div><!-- end content -->
 
<?php get_footer(); ?>