Symfony2 - 找不到目标实体

Question

这些是实体：

Objective.php

namespace Foo\BSCBundle\Entity;

class Objective{

    protected $id;
    protected $name;
    protected $perspective;
    ...   
}

Objective.orm.yml

Foo\BSCBundle\Entity\Objective:
    type: entity
    table: master.objectives
    id:
        id:
            type: integer
            generator: { strategy: AUTO }
    fields:
        name:
            type: string
    manyToOne:
        perspective:
            targetEntity: Pespective
            inversedBy: objectives
            joinColumn:
                name: perspective_id
                referencesColumn: id

Perspective.php

use Doctrine\Common\Collections\ArrayCollection;
namespace Foo\BSCBundle\Entity;



class Perspective {
    protected $id;
    protected $objectives;
    ...   
}

Perspective.orm.yml

Foo\BSCBundle\Entity\Perspective:
    type: entity
    table: perspectives
    id:
        id:
            type: integer
            generator: { strategy: AUTO }
    fields:
        name:
            type: string
            length: 100

    oneToMany:
        objectives:
            targetEntity: Objective
            mappedBy: Perspective

DefaultController.php

public function indexAction($name)
{
    $perspective = $this->getDoctrine()
    ->getRepository('FooBSCBundle:Objective')
    ->find(1);

    $params = array('name' => $name, 'perspective' => $perspective);
    return $this->render('FooBSCBundle:Default:index.html.twig', $params);
}

在我的浏览器中，我收到错误：

  

无法找到目标实体Foo \ BSCBundle \ Entity \ Pespective   in＆＃39; Foo \ BSCBundle \ Entity \ Objective＃perspective＆＃39;。 500内部   服务器错误 - MappingException

我做错了什么？