我已经创建了一个自定义post类型并扩展了文档中的WP\\u JSON\\u CustomPostType类，当我转到WP-JSON/时，我可以看到自定义类型，但只要我转到WP-JSON/就会发现这个错误，任何帮助都会很好。PS：我是插件开发新手。

register_post_type(\'quiz\',
    array(
        \'labels\' => array(
            \'name\' => __( \'Quizes\' ),
            \'singular_name\' => __(\'Quiz\'),
        ),
        \'public\' => true,
        \'has_archive\' =>true,
        \'show_ui\' =>true,
        \'show_in_menu\' => true,
        \'query_var\' => true,
        \'hierarchical\' => false,
        \'capability_type\' => \'post\',
    )
);


public function quizno_api_init($server)
{
     global $quizno_api_quiz;

     $quizno_api_quiz = new QN_API_Quiz($server);
     $quizno_api_quiz->register_filters();
}



/**
* wp-api extension
*/
class QN_API_Quiz extends WP_JSON_CustomPostType
{
    protected $base = \'quizes\';
    protected $type = \'quiz\';

    public function register_routes($routes)
    {
            $routes = parent::register_routes($routes);
            return $routes;
    }

}