pagination not working

pagination not working gives the page not found error here is my code

$paged = (get_query_var('paged')) ? get_query_var('paged') : 1;
    $country = array(
        'cat' => $catID,
        'post_type' => 'clients',
        'order' => 'ASC',
        'post_parent' => 0,
        'showposts' => 30,
        'paged' =>  $paged
    );
    $getCountry = new WP_Query($country);
    while ($getCountry->have_posts()) : $getCountry->the_post();
        ?>
        <ul>
            <li>
                <div class="col-lg-12">
                    <?php
                    $category = get_the_category();
                    $value = get_field('cat_image', 'category_' . $category[0]->cat_ID);
                    ?>
                    <a href="<?php the_permalink() ?>"><?php the_title(); ?></a>
                </div>
            </li>
        </ul>
        <?php
    endwhile;
    wp_pagenavi(array('query' => $getCountry));
    wp_reset_postdata();