Symfony 3 ralation OneToMany 在 genarate:enities 上出现关节表错误

我有以下代码（对于2个表格的广告和城市）：当我运行cmd 'php bin/console doctrine：generate：entities MyBundle'来生成setter和geter（Symfony3）时出现此错误：

[语义错误] 属性中的注释"@JoinColumn" Ligo''PlatformBundle''Entity''Advert：：$cities 从未导入。你 也许忘记为此注释添加"使用"语句？500 内部服务器错误 - 注释异常

<?php
namespace Ligo'PlatformBundle'Entity;
use Doctrine'ORM'Mapping as ORM;
use Gedmo'Mapping'Annotation as Gedmo;
/**
 * Advert
 *
 * @ORM'Table(name="advert")
 * @ORM'Entity(repositoryClass="Ligo'PlatformBundle'Repository'AdvertRepository")
 */
class Advert
{
     /**
     * @ORM'ManyToMany(targetEntity="City")
     * @ORM'JoinTable(name="adverts_cities",
     *      joinColumns={@JoinColumn(name="advert_id", referencedColumnName="id")},
     *      inverseJoinColumns={@JoinColumn(name="city_id", referencedColumnName="id", unique=true)}
     *      )
     */
    private $cities;