der link für "older posts" funktioniert nicht

<?php if (have_posts()) : ?>
     <?php $do_not_duplicate = array(); ?>
          <?php
       while ( have_posts() ) : the_post();
       $do_not_duplicate[] = get_the_ID();
     ?>
 
    <?php the_content(''); ?>
    <?php endwhile; ?>
        
    <?php 
      $random_query = new WP_Query(array(
      'post__not_in' => $do_not_duplicate, 
      'posts_per_page' => 4,
      'numberposts'     => 70, 
      'showposts' => 4,
      'orderby' => 'date',
      'cat' => '1'
      ));
      while ($random_query->have_posts()) : $random_query->the_post(); ?>
      
                    <div class="thumphotel">
                   
    
                    <?php if ( has_post_thumbnail()) : ?>
                       <a class="" href="<?php the_permalink(); ?>" >
                       <?php the_post_thumbnail(); ?>
                       </a>
                     <?php endif; ?>
                    
                    
                    
                     <div class="hotetitel"><?php the_title(); ?></div><!-- hotetitel -->
     
                      <div class="hotelocat"><u><strong>LOCATION</strong></u><br><?php echo get_post_meta($post->ID, "location", true); ?></div><!-- hotelocat -->
                    <div class="hotelocat"><u><strong>STYLE ICON</strong></u><br><?php echo get_post_meta($post->ID, "style", true); ?></div><!-- hotelocat -->
  
                      </div><!-- thumphotel -->
    
     <?php endwhile; ?>
 
 </div><!-- contagb -->    
     <div class="upnavi">
            <?php previous_posts_link('<img src="http://eightyfourrooms.com/wp-content/themes/eightyfourrooms/images/prev_butt.jpg" alt="" class="centerbut" />') ?>
            <?php next_posts_link('<img src="http://eightyfourrooms.com/wp-content/themes/eightyfourrooms/images/next_butt.jpg" alt="" class="centerbut" />', 6); ?>
         </div><!-- upnavi -->
   
    <?php else : ?>
... Inhalt wenn keine Posts vorhanden ...


 <?php endif; ?>

<?php 
      $random_query = new WP_Query(array(
      'post__not_in' => $do_not_duplicate, 
      'posts_per_page' => 4,
      'numberposts'     => 70, 
      'showposts' => 4,
      'orderby' => 'date',
      'cat' => '1',
      'paged' => get_query_var( 'page' )
      ));
      while ($random_query->have_posts()) : $random_query->the_post(); ?>