我有一个对某些字段进行自定义验证的用户类。当我提交表单时，我收到以下错误：
警告：class_parents() [function.class-parents]：类不存在，无法加载到 ..../vendor/doctrine/lib/Doctrine/ORM/Mapping/ClassMetadataFactory.php 第 223 行
有人可以告诉我我做错了什么吗？
这是我的用户类：
<?php
namespace MyBundle\Entity;
use Doctrine\ORM\Mapping as ORM;
use FOS\UserBundle\Entity\User as BaseUser;
use Symfony\Component\Validator\Constraints as Assert;
use MyBundle\Validation\Constraint as MyAssert;
/**
* @ORM\Entity
* @ORM\HasLifecycleCallbacks
*/
class User extends BaseUser
{
/**
* @ORM\Id
* @ORM\Column(type="integer")
* @ORM\generatedValue(strategy="AUTO")
*/
protected $id;
/**
* Get id
*
* @return integer $id
*/
public function getId()
{
return $this->id;
}
/**
* @var string $email
* @Assert\NotBlank(groups={"registration"})
* @Assert\Email(groups={"registration"})
* @MyAssert\Unique(groups={"registration"})
*/
protected $email;
....
堆栈跟踪：
in /myApp/vendor/symfony/src/Symfony/Component/HttpKernel/Debug/ErrorHandler.php at line 65
at ErrorHandler ->handle ('2', 'class_parents() [<a href='function.class-parents'>function.class-parents</a>]: Class does not exist and could not be loaded', '/myApp/vendor/doctrine/lib/Doctrine/ORM/Mapping/ClassMetadataFactory.php', '223', array('name' => '', 'parentClasses' => array()))
at class_parents ('')
in /myApp/vendor/doctrine/lib/Doctrine/ORM/Mapping/ClassMetadataFactory.php at line 223
at ClassMetadataFactory ->getParentClasses ('')
in /myApp/vendor/doctrine/lib/Doctrine/ORM/Mapping/ClassMetadataFactory.php at line 246
at ClassMetadataFactory ->loadMetadata ('')
in /myApp/vendor/doctrine/lib/Doctrine/ORM/Mapping/ClassMetadataFactory.php at line 170
at ClassMetadataFactory ->getMetadataFor ('')
in /myApp/vendor/doctrine/lib/Doctrine/ORM/EntityManager.php at line 257
at EntityManager ->getClassMetadata ('')
in /myApp/vendor/doctrine/lib/Doctrine/ORM/EntityManager.php at line 574
at EntityManager ->getRepository (null)
in /myApp/src/comp/MyAppBundle/Validation/Constraint/UniqueValidator.php at line 21
at UniqueValidator ->isValid ('asdfasdf', object(Unique))
in /myApp/vendor/symfony/src/Symfony/Component/Validator/GraphWalker.php at line 176
at GraphWalker ->walkConstraint (object(Unique), 'asdfasdf', 'registration', 'data.email')
in /myApp/vendor/symfony/src/Symfony/Component/Validator/GraphWalker.php at line 136
at GraphWalker ->walkMember (object(PropertyMetadata), 'asdfasdf', 'registration', 'data.email', null)
in /myApp/vendor/symfony/src/Symfony/Component/Validator/GraphWalker.php at line 119
at GraphWalker ->walkProperty (object(ClassMetadata), 'email', object(User), 'registration', 'data.email', null)
in /myApp/vendor/symfony/src/Symfony/Component/Validator/GraphWalker.php at line 111
at GraphWalker ->walkObjectForGroup (object(ClassMetadata), object(User), 'registration', 'data')
in /myApp/vendor/symfony/src/Symfony/Component/Validator/GraphWalker.php at line 82
at GraphWalker ->walkObject (object(ClassMetadata), object(User), 'registration', 'data')
in /myApp/vendor/symfony/src/Symfony/Component/Validator/GraphWalker.php at line 162
at GraphWalker ->walkReference (object(User), 'registration', 'data', true)
in /myApp/vendor/symfony/src/Symfony/Component/Form/Extension/Validator/Validator/DelegatingValidator.php at line 125
at DelegatingValidator ::validateFormData (object(Form), object(ExecutionContext))
at call_user_func (array('Symfony\Component\Form\Extension\Validator\Validator\DelegatingValidator', 'validateFormData'), object(Form), object(ExecutionContext))
in /myApp/vendor/symfony/src/Symfony/Component/Validator/Constraints/CallbackValidator.php at line 65
at CallbackValidator ->isValid (object(Form), object(Callback))
in /myApp/vendor/symfony/src/Symfony/Component/Validator/GraphWalker.php at line 176
at GraphWalker ->walkConstraint (object(Callback), object(Form), 'Default', '')
in /myApp/vendor/symfony/src/Symfony/Component/Validator/GraphWalker.php at line 104
at GraphWalker ->walkObjectForGroup (object(ClassMetadata), object(Form), 'Default', '')
in /myApp/vendor/symfony/src/Symfony/Component/Validator/GraphWalker.php at line 82
at GraphWalker ->walkObject (object(ClassMetadata), object(Form), 'Default', '')
in /myApp/vendor/symfony/src/Symfony/Component/Validator/Validator.php at line 62
at Symfony\Component\Validator\{closure} (object(GraphWalker), 'Default')
in /myApp/vendor/symfony/src/Symfony/Component/Validator/Validator.php at line 120
at Validator ->validateGraph (object(Form), object(Closure), null)
in /myApp/vendor/symfony/src/Symfony/Component/Validator/Validator.php at line 65
at Validator ->validate (object(Form))
in /myApp/vendor/symfony/src/Symfony/Component/Form/Extension/Validator/Validator/DelegatingValidator.php at line 79
at DelegatingValidator ->validate (object(Form))
in /myApp/vendor/symfony/src/Symfony/Component/Form/Form.php at line 556
at Form ->bind (array('firstname' => '', 'lastname' => '', 'username' => '', 'email' => 'asdfasdf', 'plainPassword' => array('Passwort' => '', 'Passwort wiederholen' => ''), 'code' => '', 'plan' => '10', 'phone' => '', 'street' => '', 'zip' => '', 'city' => '', 'country' => '1'))
in /myApp/vendor/symfony/src/Symfony/Component/Form/Form.php at line 592
at Form ->bindRequest (object(Request))
in /myApp/src/comp/MyAppBundle/Controller/IndexController.php at line 151
at IndexController ->registerAction ()
at call_user_func_array (array(object(IndexController), 'registerAction'), array())
in kernel.root_dir/cache/dev_local/classes.php at line 3905
at HttpKernel ->handleRaw (object(Request), '1')
in kernel.root_dir/cache/dev_local/classes.php at line 3875
at HttpKernel ->handle (object(Request), '1', true)
in kernel.root_dir/cache/dev_local/classes.php at line 4879
at HttpKernel ->handle (object(Request), '1', true)
in kernel.root_dir/bootstrap.php.cache at line 547
at Kernel ->handle (object(Request))
in /myApp/web/app_dev_local.php at line 10