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Symfony3.3运行命令时，我不断收到以下错误doctrine:generate:entities ApiUserBundle:User：

[Doctrine\ORM\Mapping\MappingException]
  Class "Api\UserBundle\Entity\User" is not a valid entity or mapped super class.

以下实体有什么问题？

<?php

namespace Api\UserBundle\Entity;

use Doctrine\ORM\Mapping as ORM;
use Symfony\Component\Security\Core\User\UserInterface;

/**
 * @ORM\Table(name="app_users")
 * @ORM\Entity
 */
class User implements UserInterface, \Serializable
{
    /**
     * @ORM\Column(type="integer")
     * @ORM\Id
     * @ORM\GeneratedValue(strategy="AUTO")
     */
    private $id;

    /**
     * @ORM\Column(type="string", length=25, unique=true)
     */
    private $username;

    /**
     * @ORM\Column(type="string", length=64)
     */
    private $password;

    /**
     * @ORM\Column(type="string", length=60, unique=true)
     */
    private $email;

    /**
     * @ORM\Column(name="is_active", type="boolean")
     */
    private $isActive;

    public function __construct()
    {
        $this->isActive = true;
        // may not be needed, see section on salt below
        // $this->salt = md5(uniqid(null, true));
    }

    public function getUsername()
    {
        return $this->username;
    }

    public function getSalt()
    {
        // you *may* need a real salt depending on your encoder
        // see section on salt below
        return null;
    }

    public function getPassword()
    {
        return $this->password;
    }

    public function getRoles()
    {
        return array('ROLE_USER');
    }

    public function eraseCredentials()
    {
    }

    /** @see \Serializable::serialize() */
    public function serialize()
    {
        return serialize(array(
            $this->id,
            $this->username,
            $this->password,
            // see section on salt below
            // $this->salt,
        ));
    }

    /** @see \Serializable::unserialize() */
    public function unserialize($serialized)
    {
        list (
            $this->id,
            $this->username,
            $this->password,
            // see section on salt below
            // $this->salt
        ) = unserialize($serialized);
    }
}

我读了很多关于@ORM\Entity 必须在那里的事实，所以它就在那里，但我不断收到这个错误，我不知道还能去哪里找。在其他主题之后，我看到它也可能取决于 orm 配置（config.yml）。关注我的：

orm:
    auto_generate_proxy_classes: '%kernel.debug%'
    naming_strategy: doctrine.orm.naming_strategy.underscore
    auto_mapping: true

我有 fos_user 包。我认为这可能与它有关。

有什么线索吗？

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