批注“@Gedmo\Mapping\annotation\Sortable不存在,或无法自动加载

我使用“stof/docine extensions bundle”:“v1.3.0”,

配置yml

stof_doctrine_extensions:
    default_locale: %locale%
    orm:
        default:
            tree: ~
            timestampable: ~
            sortable: ~
            sluggable: ~
            #translatable:   ~

实体

/**

 * @Gedmo\Sortable()
 * @ORM\Column(name="position", type="integer")
 * @var integer
 */
protected $position;

php bin/console原则:schema:update--dump sql

把我的

In AnnotationException.php line 54:

  [Semantical Error] The annotation "@Gedmo\Mapping\Annotation\Sortable" in property Mea\TaskBundle\Entity\Task::$position does not exist,  
   or could not be auto-loaded.