JMS Serializer / Symfony class does not exist

I have an entity with some OneToOne relations:

/**
 * @OAProperty(type="integer")
 * @SerializerGroups({"list", "detail"})
 * @SerializerType("File::class")
 * @ORMOneToOne(targetEntity="File")
 */
private ?File $cv = null;

And here is the File entity:

/**
 * @OASchema()
 * @ORMEntity(repositoryClass=FileRepository::class)
 */
class File
{

    /**
     * @OAProperty(type="integer")
     * @SerializerGroups({"list", "detail"})
     * @SerializerType("integer")
     * @ORMId
     * @ORMGeneratedValue
     * @ORMColumn(type="integer")
     */
    private $id;

    /**
     * @OAProperty(type="string")
     * @SerializerGroups({"list", "detail"})
     * @SerializerType("string")
     * @ORMColumn(type="string", length=255, nullable=false)
     */
    private $filename;

    /**
     * @OAProperty(type="string")
     * @SerializerGroups({"list", "detail"})
     * @SerializerType("string")
     * @ORMColumn(type="guid", nullable=false)
     */
    private $uuid;

    /**
     * @OAProperty(type="string")
     * @SerializerGroups({"list", "detail"})
     * @SerializerType("string")
     * @ORMColumn(type="string", length=255, nullable=false)
     */
    private $contentType;

    /**
     * @OAProperty(type="string", format="date-time")
     * @SerializerGroups({"list", "detail"})
     * @SerializerType("string")
     * @ORMColumn(type="date", length=255, nullable=false)
     */
    private $creationDate;

When I try to serialize with JMS my first entity, with the OneToOne relation:

        $data = $this->serializer->serialize($candidate, 'json', SerializationContext::create()->setGroups(array('detail'))->setSerializeNull(true));

I always got the error: Class File does not exist

Obviously, it’s my @Type annotation that is wrong, but why? What should I do.

Source: Symfony Questions

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