menü und das problem mit den Kategorien

<?php 


/**
 *
 * single.php
 *
 * The single post template. Used when a single post is queried.
 * 
 */    


get_header(); ?>
<div class="art-layout-wrapper">
    <div class="art-content-layout">
        <div class="art-content-layout-row">
            <div class="art-layout-cell art-content">
            <?php get_sidebar('top');  ?>
            <?php 
                if (have_posts()){
                    /* Display navigation to next/previous posts when applicable */
                    if (theme_get_option('theme_top_single_navigation')) {
                        theme_page_navigation(
                            array(
                                'next_link' => theme_get_previous_post_link('&laquo; %link'),
                                'prev_link' => theme_get_next_post_link('%link &raquo;')
                            )
                        );
                    }
                    
                    while (have_posts())  
                    {
                        the_post();
                        get_template_part('content', 'single');
                        /* Display comments */
                        if ( theme_get_option('theme_allow_comments')) {
                            comments_template();
                        }
                    }
                    
                    /* Display navigation to next/previous posts when applicable */
                    if (theme_get_option('theme_bottom_single_navigation')) {
                        theme_page_navigation(
                            array(
                                'next_link' => theme_get_previous_post_link('&laquo; %link'),
                                'prev_link' => theme_get_next_post_link('%link &raquo;')
                            )
                        );
                    }
                    
                } else {    
                  
                    theme_404_content();
                    
                } 
            ?>
            <?php get_sidebar('bottom'); ?> 
              <div class="cleared"></div>
            </div>
            <div class="art-layout-cell art-sidebar1">
              <?php get_sidebar('default'); ?>
              <div class="cleared"></div>
            </div>
        </div>
    </div>
</div>
<div class="cleared"></div>
<?php get_footer(); ?>