Display level1 posts in a specific category

Hello
My structure is:
-Category(level1)
–Post1
–Post2
–Category2(level2)
—Post
—Post

I want to show only the first level posts, i tried this code but it shows me all posts:

<?php 
$args = array(
              'post_type' => 'knowledgebase',
              'tax_query' => array(
                             array(
                                'taxonomy' => 'knowledgebase_category',
                                'terms'    => 31,
                                'hide_empty' => false,

                    ),
                  ),
                );

                    $catquery = new WP_Query( $args );

                    echo '<ul>';

                        while($catquery->have_posts()) : $catquery->the_post();

                        echo"<li>

                        the_title();

                        echo "</li>";
                        endwhile;   

                    echo '</ul>';
?>

Thank you

• This topic was modified 8 years, 4 months ago by fariss49.