php - Zf 3 サービスと ServiceManager の紹介

Question

エラーが発生します：

Fatal error: Class Blog\Factory\ListControllerFactory contains 1 abstract method and must therefore be declared abstract or implement the remaining methods (Zend\ServiceManager\Factory\FactoryInterface::__invoke) in /d0/home/kgendig/www/Zend/module/Blog/src/Blog/Factory/ListControllerFactory.php on line 28

私は https://framework.zend.com/manual/2.4/en/in-depth-guide/services-and-servicemanager.htmlですべてをやっています

変更する必要があるのは、私の zend_version(); です。2.6.0です

<?php
// Filename: /module/Blog/src/Blog/Factory/ListControllerFactory.php
namespace Blog\Factory;

use Blog\Controller\ListController;
use Zend\ServiceManager\FactoryInterface;
use Zend\ServiceManager\ServiceLocatorInterface;

class ListControllerFactory implements FactoryInterface
{
    /**
     * Create service
     *
     * @param ServiceLocatorInterface $serviceLocator
     *
     * @return mixed
     */
    public function createService(ServiceLocatorInterface $serviceLocator)
    {
        $realServiceLocator = $serviceLocator->getServiceLocator();
        $postService        = $realServiceLocator->get('Blog\Service\PostServiceInterface');

        return new ListController($postService);
    }
}