error entity YY was not found in the chain configured namespaces

[Nelson Rodriguez]

HI, please help
In my app development need to add an upload file like is shown in the Sonata demo bundle, car item when offer the option of associate a file

Here is the code about the entity car.php

<?php

namespace Sonata\Bundle\DemoBundle\Entity;

use Doctrine\Common\Collections\ArrayCollection;
use Doctrine\ORM\Mapping as ORM;
use Sonata\MediaBundle\Model\MediaInterface;
use Symfony\Component\Validator\Constraints as Assert;

/**
 * @ORM\Entity
 * @ORM\InheritanceType("SINGLE_TABLE")
 * @ORM\Table(name="test_car")
 * @ORM\DiscriminatorColumn(name="discr", type="string")
 * @ORM\DiscriminatorMap({
 *     "renault" = "Renault",
 *     "citroen" = "Citroen",
 *     "peugeot" = "Peugeot"
 * })
 */
abstract class Car
{
…
…
…

    /**
     * @var \AppBundle\Entity\Media\Media
     * @ORM\ManyToOne(targetEntity="AppBundle\Entity\Media\Media", cascade={"persist"}, fetch="LAZY")
     */
    protected $media;

    public function __construct()
    {
        $this->inspections = new ArrayCollection();
    }

    /**
…
…
…

    /**
     * @return \AppBundle\Entity\Media\Media
     */
    public function getMedia()
    {
        return $this->media;
    }

    /**
     * @param \AppBundle\Entity\Media\Media $media
     */
    public function setMedia(MediaInterface $media = null)
    {
        $this->media = $media;
    }

    /**
     * @return string
     */
    public function __toString()
    {
        return $this->getName() ?: 'n/a';
    }
}

This the entity in my app

<?php

namespace Intranet\Pni\OeuBundle\Entity;

use Doctrine\Common\Collections\ArrayCollection;
use Doctrine\ORM\Mapping as ORM;
use Sonata\MediaBundle\Model\MediaInterface;
use Symfony\Component\Validator\Constraints as Assert;

/**
 * SoporteFormalCambios
 *
 * @ORM\Table(name="soporte_formal_cambios", indexes={@ORM\Index(name="idx_tipo_soporte_formal_cambios", columns={"id_tipo_soporte_formal_cambios"})})
 * @ORM\Entity
 */
class SoporteFormalCambios
{
…
…
…

    /**
     * @var \AppBundle\Entity\Media\Media
     * @ORM\ManyToOne(targetEntity="\AppBundle\Entity\Media\Media", cascade={"persist"}, fetch="LAZY")
     */
    protected $media;
…
…
…

    /**
     * @return \AppBundle\Entity\Media\Media
     */
    public function getMedia()
    {
        return $this->media;
    }

    /**
     * @param \AppBundle\Entity\Media\Media $media
     */
    public function setMedia(MediaInterface $media = null)
    {
        $this->media = $media;
    }
}

now the admin controllers

<?php
amespace Sonata\Bundle\DemoBundle\Admin;

use Sonata\AdminBundle\Admin\Admin;
use Sonata\AdminBundle\Show\ShowMapper;
use Sonata\AdminBundle\Form\FormMapper;
use Sonata\AdminBundle\Datagrid\ListMapper;
use Sonata\AdminBundle\Datagrid\DatagridMapper;
use Sonata\Bundle\DemoBundle\Entity\Inspection;

/**
 * @author Thomas Rabaix <thomas...@sonata-project.org>
 */
class CarAdmin extends Admin
{
…
…
…

    /**
     * {@inheritdoc}
     */
    protected function configureFormFields(FormMapper $formMapper)
    {
        $formMapper
    …
    …
    …

            ->with('Options', array('class' => 'col-md-7'))
                ->add('engine', 'sonata_type_model_list')
                ->add('color', 'sonata_type_model_list')
                ->add('media', 'sonata_media_type', array(
                    'provider' => 'sonata.media.provider.image',
                    'context' => 'default',
                ))
            ->end()
    …
    …
    …   
        ;
    }
}
?>

this is the admin controller on my app

<?php
namespace Intranet\Pni\OeuBundle\Admin;

use Sonata\AdminBundle\Admin\AbstractAdmin;
use Sonata\AdminBundle\Datagrid\ListMapper;
use Sonata\AdminBundle\Datagrid\DatagridMapper;
use Sonata\AdminBundle\Show\ShowMapper;
use Sonata\AdminBundle\Form\FormMapper;
use Symfony\Bridge\Doctrine\Form\Type\EntityType;
use Symfony\Component\Form\Extension\Core\Type\ChoiceType;
use Symfony\Component\Form\Extension\Core\Type\DateTimeType;
use Symfony\Component\Form\Extension\Core\Type\TextType;
use Symfony\Component\Form\Extension\Core\Type\FileType;
use Vich\UploaderBundle\Form\Type\VichFileType;
use Sonata\AdminBundle\Route\RouteCollection;
use Symfony\Component\OptionsResolver\OptionsResolver;

use Sonata\Bundle\DemoBundle\Entity\Inspection;

class SoporteFormalCambiosAdmin extends AbstractAdmin
{
    protected function configureFormFields(FormMapper $formMapper)
    {
        $formMapper
    …
    …
    …
            ->add('media', 'sonata_media_type',
                array(
                    'provider' => 'sonata.media.provider.image',
                    'context' => 'default',
                )
            )
        ;
    }

    public function configureOptions(OptionsResolver $resolver)
    {
        $resolver->setDefaults(
            array(
                'data_class' => 'AppBundle\Intranet\Pni\OeuBundle\Entity\SoporteFormalCambios',
            )
        );
    }

…
…
…

}

in other words this parameterized files are relatively  similar  but I get the following error:
An exception has been thrown during the rendering of a template ("The class 'AppBundle\Entity\Media\Media' was not found in the chain configured namespaces Intranet\Pni\OeuBundle\Entity").

What I m forgetting? How I have to configure the chain of   configured namespaces?
Some Clue?