my code should show popular posts where the meta key "slider" isn't empty. Have anyone an idea why it doesn't work?

The problem is that this code only shows posts with a slider image. But it ignores the sorting.

```
$values = array(
  'numberposts' => 10,
  'orderby' => 'meta_value_num',
  'meta_key' => 'count_views',
  'meta_query' => array(
      array(
        'key'     => 'slider',
        'compare' => '!=',
        'value'   => ''
      )
  )
);

$my_posts = get_posts( $values );
global $post;
foreach( $my_posts as $post ) : setup_postdata($post);

   the_title();

endforeach;
wp_reset_postdata();

```