我一直在努力根据分类法slug“peers”引入自定义帖子，我不知道我做错了什么！

   \'coaches_post_type\' => [
        \'slug\'                      => \'coaches\',
        \'name_plural\'               => \'Coaches\',
        \'name_singular\'             => \'Coach\',
        \'taxonomy_slug\'             => \'coaches_category\',
        \'taxonomy_rewrite\'          => \'coaches-category\',
        \'taxonomy_name_plural\'      => \'Coach Categories\',
        \'taxonomy_name_singular\'    => \'Coach Category\'
    ],


public static function WhoHTML() {

    $args = array(
        \'post_type\' => \'coaches\',
        \'posts_per_page\' => \'4\',
        \'order\' => \'DESC\',
        \'orderby\' => \'date\',
        \'tax_query\' => array(
            array(
                  \'taxonomy\' => \'coaches_category\',
                  \'field\' => \'slug\',
                  \'terms\' => \'peers\'
            )
         )
    );

    $coaches = new WP_Query($args);

    foreach ($coaches->posts as $coach) {

        $image = get_the_post_thumbnail_url($coach->ID);

        $html .= "<div class=\'single-coach\'>
            <img class=\'coach-image img-responsive\' src=\'$pluginDirectory/assets/images/square.png\' />
            <p class=\'coach-name\'>{$coach->post_title}</p>
        </div>";
    }

    echo $html;
    return;
}