Symfony2 doctrine2 insert record [Semantical Error] The annotation - php

Question

When trying to insert a record to doctrine, records is inserting but i am getting an error :
[Semantical Error] The annotation "#Expose" in property
C2Educate\ToolsBundle\Entity\StudentScores::$id was never imported.
Did you maybe forget to add a "use" statement for this
annotation? (500 Internal Server Error)
Entity :
<?php
namespace C2Educate\ToolsBundle\Entity;
use Doctrine\ORM\Mapping as ORM;
use JMS\SerializerBundle\Annotation\Type;
/**
* C2Educate\ToolsBundle\Entity\StudentScores
*
* #ORM\Table(name="tbl_student_scores")
* #ORM\Entity
*/
class StudentScores {
/**
* #var integer $id
*
* #ORM\Column(name="id", type="integer", nullable=false)
* #ORM\GeneratedValue(strategy="SEQUENCE")
* #ORM\SequenceGenerator(sequenceName="tbl_student_scores_id_seq", allocationSize="1", initialValue="1")
* #Expose
* #Type("integer")
*/
protected $id;
/**
* #var integer $studentId
*
* #ORM\Column(name="student_id", type="integer", nullable=true)
* #Assert\NotBlank()
* #Type("integer")
*/
private $studentId;
/**
* Get id
*
* #return integer
*/
public function getId() {
return $this->id;
}
/**
* Set studentId
*
* #param string $studentId
*/
public function setStudentId($studentId) {
$this->studentId = $studentId;
}
/**
* Get studentId
*
* #return string
*/
public function getStudentId() {
return $this->studentId;
}
}
Controller Script :
$em = $this->getDoctrine()->getEntityManager();
$sc = new StudentScores();
$sc->setScore((!empty($test->composite) ? $test->composite : 0));
$sc->setTestDate($test->test_date);
$sc->setcreatedBy($loggedinUser);
$sc->setCreatedAt($date);
$sc->setupdatedBy($loggedinUser);
$sc->setUpdatedAt($date);
$sc->setStudentId($returnID);
$em->persist($sc);
$em->flush();

Answer 1

You forgot to add use statements as it says in error description. Try this
use JMS\Serializer\Annotation\ExclusionPolicy;
use JMS\Serializer\Annotation\Expose;