我注册了一个名为districts的分类法，但当我将districts添加到nav菜单时，nav菜单项无效！以下是注册分类的代码：

    function masallah() {

    // Add new taxonomy, make it hierarchical like categories
    //first do the translations part for GUI

        $labels = array(
            \'name\' => _x( \'Districts\', \'taxonomy general name\' ),
            \'singular_name\' => _x( \'District\', \'taxonomy singular name\' ),
            \'search_items\' =>  __( \'Search Districts\' ),
            \'all_items\' => __( \'All Districts\' ),
            \'parent_item\' => __( \'Parent Districts\' ),
            \'parent_item_colon\' => __( \'Parent District:\' ),
            \'edit_item\' => __( \'Edit District\' ),
            \'update_item\' => __( \'Update District\' ),
            \'add_new_item\' => __( \'Add New District\' ),
            \'new_item_name\' => __( \'New Topic District\' ),
            \'menu_name\' => __( \'Districts\' ),
        );

    // Now register the taxonomy

        register_taxonomy(\'Districts\',array(\'post\'), array(
            \'hierarchical\' => true,
            \'labels\' => $labels,
            \'show_ui\' => true,
            \'show_admin_column\' => true,
            \'query_var\' => true,
            \'show_in_rest\' => true,
            \'rewrite\' => true,
            \'rewrite\' => array( \'slug\' => \'districts\' ),
            \'has_archive\' => true,
        ));

    }

    add_action( \'init\', \'masallah\', 0 );