Recuperate object with DQL

gistfile1.txt

/**
 * @ORM\Entity
 * @ORM\Table(name="asistencia")
 * @ORM\Entity(repositoryClass="sdfs\sdfsBundle\EntityManager\AsistenciaRepository")
 */
class Asist{
	
	/**
	 * @ORM\Id
	 * @ORM\Column(type="integer")
	 * @ORM\GeneratedValue(strategy="AUTO")
	 */
	protected $id;
	/**
	 * @ORM\ManyToOne(targetEntity="myproject\MyBundle\Entity\User", inversedBy="asistencias")
	 * @ORM\JoinColumn(name="usuario_id", referencedColumnName="id")
	 */
	protected $user;
	/**
	 * @ORM\ManyToOne(targetEntity="myproject\MyBundle\Entity\Evento", inversedBy="asistencias")
	 * @ORM\JoinColumn(name="evento_id", referencedColumnName="id")
	 */
	protected $event;

In my repository:

public function myAsist($user){
		$em = $this->getEntityManager();
		$Query = $em->createQuery('SELECT a.event FROM MyBundle:Asist a
					WHERE a.user = :user
					');
		$Query->setParameter('user',$user);
		return $Query->getResult();
	}


I get the following error:
An exception has been thrown during the rendering of a template ("[Semantical Error] line 0, col 9 near 'event FROM MyBundle:Asist': Error: Invalid PathExpression. Must be a StateFieldPathExpression.") in MyBundle:XXX:XXX.html.twig at line 108. 

With :

$Query = $em->createQuery('SELECT e FROM MyBundle:Event e JOIN e.asistencias a WHERE a.user = :user
                    ');
        $Query->setParameter('user',$user);
        return $Query->getResult();

My Entity event.php has:

/*
     *@ORM\OneToMany(targetEntity="myproject\MyBundle\Entity\Asistencia", mappedBy="event")
    */
    protected $asistencias;

I get the error:

An exception has been thrown during the rendering of a template ("[Semantical Error] line 0, col 53 near 'a WHERE a.user': Error: Class myproject\MyBundle\Entity\Event has no association named asistencias") in MyBundle:xxx:XXX.html.twig at line 108.