双向关系ManyToMany symfony

I need help for my problem. When add the relationship ManyToMany to the php script this return when validate the relationship. This is my scripts:

   class Post implements ResourceInterface, TranslatableInterface
{
    /**
     * @var int
     */
    private $id;

    /**
     * @var bool
     */
    private $important;
    /**
     * @var \Doctrine\Common\Collections\Collection
     *
     * @ORM\ManyToMany(targetEntity="AppBundle\Entity\Tag", inversedBy="posts")
     * @ORM\JoinTable(name="posts_tags",
     *   joinColumns={
     *     @ORM\JoinColumn(name="post_id", referencedColumnName="id", onDelete="CASCADE")
     *   },
     *   inverseJoinColumns={
     *     @ORM\JoinColumn(name="tag_id", referencedColumnName="id")
     *   }
     * )
     */
    private $tags;
}

And

class Tag implements ResourceInterface, TranslatableInterface
{
    use TranslatableTrait {
        __construct as private initializeTranslationsCollection;
    }

    /**
     * @var int
     */
    private $id;

    /**
     * @var \Doctrine\Common\Collections\Collection
     *
     * @ORM\ManyToMany(targetEntity="AppBundle\Entity\Post", 
    mappedBy="tags")
     */
    private $posts;
}

The error is:

Mapping

[FAIL] The entity-class AppBundle\Entity\Tag mapping is invalid: * The field AppBundle\Entity\Tag#posts is on the inverse side of a bi-
directional relationship, but the specified mappedBy association on the target-entity AppBundle\Entity\Post#tags does not contain the required 'inversedBy="posts"' attribute.

Hello use symfony maker

. /bin/console make:entity Post

For the field name enter 'tags' and for the type enter 'relation' . Then give the related tags entity name. Shoud be Tag. Choose the manytomany relation and enter. Like this you should never have relation issue :-). Even if the entity exist already.

maybe the mapping of the tags attribute in the post entity should be like this:

class Post implements ResourceInterface, TranslatableInterface
{
    /**
     * @var int
     */
    private $id;

    /**
     * @var bool
     */
    private $important;
    /**
     * @var \Doctrine\Common\Collections\Collection
     *
     * @ORM\ManyToMany(targetEntity="AppBundle\Entity\Tag", inversedBy="posts", cascade={"persist"})
     * @ORM\JoinTable(name="posts_tags",
     *   joinColumns={
     *     @ORM\JoinColumn(name="post_id", referencedColumnName="id")
     *   },
     *   inverseJoinColumns={
     *     @ORM\JoinColumn(name="tag_id", referencedColumnName="id")
     *   }
     * )
     */
    private $tags;
}

I hope I've helped :)