Symfony2 Embedded Form and MongoDB issue

I try to embed a form type into another form type :

$builder->add('geolocation', new GeolocationType());

However when I try and bind the request to the form

if($request->getMethod() == 'POST') {
  $form->bindRequest($request);
}

I get the error

Catchable Fatal Error: Argument 1 passed to Company\StoreBundle\Document\Place::setGeolocation() must be an instance of Company\StoreBundle\Document\Geolocation, array given, called in
/var/www/Company/vendor/symfony/src/Symfony/Component/Form/Util/PropertyPath.php on line 392 and defined in /var/www/Company/src/Company/StoreBundle/Document/Place.php line 43

The data_class is set either for the PlaceType and the GeolocationType

Here is my code :

Place.php

namespace Company\StoreBundle\Document;

use Doctrine\ODM\MongoDB\Mapping\Annotations as MongoDB;

/**
 * @MongoDB\Document(collection="places")
 */
class Place
{
    /**
     * @MongoDB\Id
     */
    private $id;

    /**
     * @MongoDB\String
     */
    private $title;

    /**
     * @MongoDB\EmbedOne(targetDocument="Geolocation")
     */
    private $geolocation;


    /**
     * Get id
     *
     * @return id $id
     */
    public function getId()
    {
        return $this->id;
    }

    /**
     * Set geolocation
     *
     * @param Company\StoreBundle\Document\Geolocation $geolocation
     */
    public function setGeolocation(\Company\StoreBundle\Document\Geolocation $geolocation)
    {
        $this->geolocation = $geolocation;
    }

    /**
     * Get geolocation
     *
     * @return Company\StoreBundle\Document\Geolocation $geolocation
     */
    public function getGeolocation()
    {
        return $this->geolocation;
    }

    /**
     * Set title
     *
     * @param string $title
     */
    public function setTitle($title)
    {
        $this->title