VichUploader : MediaObject is not uploadable

I try to upload file throught a REST API with API Plateform

I followed the doc, but I got :

"The class \"App\\Entity\\MediaObject\" is not uploadable. If you use attributes to configure VichUploaderBundle, you probably just forgot to add `#[Vich\\Uploadable]` on top of your entity. If you don't use attributes, check that the configuration files are in the right place. In both cases, clearing the cache can also solve the issue.",

I'am using :

"api-platform/core": "^3.0",
"vich/uploader-bundle": "^2.0"

My config :

# api/config/packages/vich_uploader.yaml
vich_uploader:
  db_driver: orm
  metadata:
    type: attribute
  mappings:
    media_object:
      uri_prefix: /media
      upload_destination: '%kernel.project_dir%/public/media'
      namer: Vich\UploaderBundle\Naming\OrignameNamer

My entity :

<?php
// api/src/Entity/MediaObject.php
namespace App\Entity;

use ApiPlatform\Metadata\ApiProperty;
use ApiPlatform\Metadata\ApiResource;
use ApiPlatform\Metadata\Get;
use ApiPlatform\Metadata\GetCollection;
use ApiPlatform\Metadata\Post;
use App\Controller\CreateMediaObjectAction;
use Doctrine\ORM\Mapping as ORM;
use Symfony\Component\HttpFoundation\File\File;
use Symfony\Component\Serializer\Annotation\Groups;
use Symfony\Component\Validator\Constraints as Assert;
use Vich\UploaderBundle\Mapping\Annotation as Vich;

#[Vich\Uploadable]
#[ORM\Entity]
#[ApiResource(
    normalizationContext: ['groups' => ['media_object:read']], 
    types: ['https://schema.org/MediaObject'],
    operations: [
        new Get(),
        new GetCollection(),
        new Post(
            controller: CreateMediaObjectAction::class, 
            deserialize: false, 
            validationContext: ['groups' => ['Default', 'media_object_create']], 
            openapiContext: [
                'requestBody' => [
                    'content' => [
                        'multipart/form-data' => [
                            'schema' => [
                                'type' => 'object', 
                                'properties' => [
                                    'file' => [
                                        'type' => 'string', 
                                        'format' => 'binary'
                                    ]
                                ]
                            ]
                        ]
                    ]
                ]
            ]
        )
    ]
)]
class MediaObject
{
    #[ORM\Id, ORM\Column, ORM\GeneratedValue]
    private ?int $id = null;

    #[ApiProperty(types: ['https://schema.org/contentUrl'])]
    #[Groups(['media_object:read'])]
    public ?string $contentUrl = null;

    #[Vich\UploadableField(mapping: "media_object", fileNameProperty: "filePath")]
    #[Assert\NotNull(groups: ['media_object_create'])]
    public ?File $file = null;

    #[ORM\Column(nullable: true)] 
    public ?string $filePath = null;

    public function getId(): ?int
    {
        return $this->id;
    }
}

In my case this resolved the problem:

composer require doctrine/annotations