Custom Post Type query not working

Try replacing

$wp_query->query( $args );

with

$wp_query = new WP_Query( $args );

and go into Settings > Permalinks and click save.

Thanks for update me,
I change that

<?php  

                        $args = array (
                            'post_type'          => 'artistspage',
                            'posts_per_page'     => 6,
                            'order'              => 'ASC',
                            'orderby'            => 'modified',
                            'paged'              => get_query_var('paged')
                        );
                        // The Query
                        $wp_query = new WP_Query( $args );
                        while ( $wp_query->have_posts() ) : $wp_query->the_post();
                        ?>
                            <div class="thumb-who">
                                <a href="<?php the_permalink(); ?>">
                                <?php the_post_thumbnail('who-thumb'); ?>
                                </a>
                                <h2><a href="<?php the_permalink() ?>" rel="bookmark"><?php the_title(); ?></a></h2>
                                <p><?php the_excerpt(); ?></p>
                                <a href="<?php the_permalink() ?>" id="read-more" rel="bookmark">Read More ></a>
                            </div>
                        <?php

                        endwhile;
                        wp_pagenavi( array( 'query' => $wp_query ) );
                        wp_reset_postdata();	// avoid errors further down the page

                    ?>

In my Settings > Permalinks, I select Custom Structure and put this /%category%/%postname%/

But no success for me.

Where

<?php
                        // WP_Query arguments
                        if ( get_query_var('paged') ) { $paged = get_query_var('paged'); }
                        elseif ( get_query_var('page') ) { $paged = get_query_var('page'); }
                        else { $paged = 1; }
                        $args = array (
                            'category_name'          => 'news',
                            'pagination'             => true,
                            'posts_per_page'         => '6',
                            'order'                  => 'ASC',
                            'orderby'                => 'modified',
                            'paged'                  => $paged
                        );
                        // The Query
                        $my_query = new WP_Query( $args );
                        while ( $my_query->have_posts() ) : $my_query->the_post();
                        ?>
                            <div class="thumb-who">
                                <a href="<?php the_permalink(); ?>">
                                <?php the_post_thumbnail('who-thumb'); ?>
                                </a>
                                <h2><a href="<?php the_permalink() ?>" rel="bookmark"><?php the_title(); ?></a></h2>
                                <p><?php the_excerpt(); ?></p>
                                <a href="<?php the_permalink() ?>" id="read-more" rel="bookmark">Read More ></a>
                            </div>
                        <?php
                        endwhile;
                        wp_pagenavi( array( 'query' => $my_query ) );
                        wp_reset_postdata();	// avoid errors further down the page
                        ?>

Working fine for and Give results at https://www.domain.tld/news/page/2/ too

Working for Category Query but not working for Post_type

Thank you