我无法从while循环中获得任何东西：

<ul>
    <?php
    $query_args = array(
        \'post_type\' => \'Smart panels\',
        \'posts_per_page\' => 5,
        \'orderby\' => \'meta_value_num\',
        \'meta_key\' => \'post_views_count\'
    );
    $query = new WP_Query($query_args);
    while($query->have_posts()) : $query->the_post();

        echo "<li>post</li>";

    endwhile; 
    ?>
</ul>