Symfony Semantical Error as constraints - symfony

Question

After typing this command (php app/console generate:doctrine:entities CoreBundle:Post
) by Terminal the error below appears, How can I solve this?
[Doctrine\Common\Annotations\AnnotationException]
[Semantical Error] The annotation
"#Symfony\Component\Validator\Constraints" in property
Blog\CoreBundle\Entity\Post::$body does not exist, or could not be
auto-loaded.
Source Code:
namespace Blog\CoreBundle\Entity;
use Doctrine\ORM\Mapping as ORM;
use Symfony\Component\Validator\Constraints as Assert;
/**
* Post
*
* #ORM\Table()
* #ORM\Entity
*/
class Post extends Timestamp
{
/**
* #var integer
*
* #ORM\Column(name="id", type="integer")
* #ORM\Id
* #ORM\GeneratedValue(strategy="AUTO")
*/
private $id;
/**
* #var string
*
* #ORM\Column(name="title", type="string", length=255)
*/
private $title;
/**
* #var string
*
* #ORM\Column(name="body", type="text")
*
* #Assert|NotBlank
*/
private $body;
/**
* #var Author
*
* #ORM\ManyToOne(targetEntity="Author", inversedBy="posts")
* #ORM\JoinColumn(name="author_id", referecedColumnName="id", nullable=false)
*/
protected $author;
/**
* Get id
*
* #return integer
*/
public function getId()
{
return $this->id;
}
/**
* Set title
*
* #param string $title
* #return Post
*/
public function setTitle($title)
{
$this->title = $title;
return $this;
}
/**
* Get title
*
* #return string
*/
public function getTitle()
{
return $this->title;
}
/**
* Set body
*
* #param string $body
* #return Post
*/
public function setBody($body)
{
$this->body = $body;
return $this;
}
/**
* Get body
*
* #return string
*/
public function getBody()
{
return $this->body;
}
}

Answer 1

I think you have a typo in the #Assert annotation on the $body property. You're using a pipe symbol | instead of a backslash \.