Генерация setters и getters на symfony

php app/console doctrine:generate:entities AppBundle/Entity/Product

 [Doctrine\Common\Annotations\AnnotationException]                                                  
  [Semantical Error] The annotation "@Assert\NotBlank" in property AppBundle\Entity\Person::$email   
  was never imported. Did you maybe forget to add a "use" statement for this annotation?

<?php
 
namespace AppBundle\Entity;
use Symfony\Component\Validator\Constraints as Asset;
use Doctrine\ORM\Mapping as ORM;
 
/**
 * Person
 *@ORM\Entity(repositoryClass="AppBundle\Repository\PersonRepository")
 * @ORM\Table(name="person")
 */
class Person
{
    /**
     * @ORM\Column(type="integer")
     * @ORM\Id
     * @ORM\GeneratedValue(strategy="AUTO")
     *
     * @var integer
     */
    protected $id;
 
    /**
     * @Assert\NotBlank()
     * @Assert\Email("message = "The email '{{ value }}' is not a valid email.", checkMX = true")
     * @ORM\Column(type="string", length = 40)
     * @var string
     */
    protected $email;
    /*
     * @Assert\NotBlank()
     * @ORM\Column(type="string",length = 50)
     */
    protected $name;
    /*
     * @Asset\NotBlank()
     * @ORM\Column(type="string",length= 50)
     */
    protected $lastname;
    /*
     * @Asset\NotBlank()
     * @ORM\Column(type="string")
     *
     */
    protected $password;
 
    //get email and setEmail
    public function getEmail()
    {
        return $this->email;
    }
 
    public function setEmail($email)
    {
        $this->email = $email;
    }
 
    //get name and setName
    public function getName()
    {
        return $this->name;
    }
    public function setName($name)
    {
        $this->name = $name;
    }
    //get lastname and setLastname
    public function getLastname()
    {
        return $this->lastname;
    }
    public function setLastname()
    {
        $this->lastname = $lastname;
    }
    /**
     * Get id
     *
     * @return integer
     */
    public function getId()
    {
        return $this->id;
    }
}

use Symfony\Component\Validator\Constraints as Asset;

    /**
     * @Assert\NotBlank()
     * @Assert\Email("message = "The email '{{ value }}' is not a valid email.", checkMX = true")
     * @ORM\Column(type="string", length = 40)
     * @var string
     */

use Symfony\Component\Validator\Constraints as Assert;