404 (Not Found) bei RSS-Aufruf

<?php if ($posts) {
                                                 $AsideId = get_settings('Rainbow_asideid');
                                                 function ml_hack($str)
                                                 {
                                                             return preg_replace('|</ul>\s*<ul class="asides">|', '', $str);
                                                 }
                                                 ob_start('ml_hack');
                                                 foreach($posts as $post)
                                                 {
                                                             start_wp();
                                                 ?>
                                                 <?php if ( in_category($AsideId) && !is_single() ) : ?>
                                                             <ul class="asides">
                                                                         <li id="p<?php the_ID(); ?>">
                                                                                    <?php echo wptexturize($post->post_content); ?>                                                                             
                                                                                    <br/>
                                                                                    <p class="postmetadata"><?php comments_popup_link('(0)', '(1)','(%)')?>  | <a href="<?php the_permalink(); ?>"   
  
title="Permalink: <?php echo wptexturize(strip_tags(stripslashes($post->post_title), '')); ?>" rel="bookmark">#</a> <?php edit_post_link('(edit)'); ?></p>
                                                                         </li>                                                                
                                                             </ul>
                                                 <?php else: // If it's a regular post or a permalink page ?>        
                                                 <div class="post" id="post-<?php the_ID(); ?>">
                                                 <div class="posttitle">
                                                             <h2><a href="<?php the_permalink() ?>" rel="bookmark" title="Permanent Link to <?php the_title(); ?>" style="color:0033666;"><?php the_title(); ?></a></h2>
                                                             <p class="post-info"><?php the_time('M jS, Y') ?> by <?php the_author_posts_link() ?> <?php edit_post_link('Edit', '', ' | '); ?> </p>
                                                 </div>
                                                 
                                                 <div class="entry">
                                                             <?php the_content('Continue Reading &raquo;'); ?>
                                                             <?php wp_link_pages(); ?>
                                                 </div>
                          
                                                 <p class="postmetadata">Posted in <?php the_category(', ') ?> | <?php comments_popup_link('No Comments »', '1 Comment »', '% Comments »'); ?></p>
                                                 <?php comments_template(); ?>
                                     </div>
                                     <?php endif; // end if in category ?>