Somfony 3.2.7 and sonata media bundle installation

[Hype Digger]

Hello

I'm trying to install sonata media bundle on a symfony 3.2.7/php7/doctrine environnement.

I'm folowing this doc : https://sonata-project.org/bundles/media/3-x/doc/reference/installation.html
But i have an error when i'm using this command line, to generate DB : php bin/console doctrine:schema:update --force

the error message :

[Doctrine\DBAL\DBALException]
  Unknown column type "json" requested. Any Doctrine type that you use has to be registered with \Doctrine\DBAL\Types\Type::addT
  ype(). You can get a list of all the known types with \Doctrine\DBAL\Types\Type::getTypesMap(). If this error occurs during da
  tabase introspection then you might have forgot to register all database types for a Doctrine Type. Use AbstractPlatform#regis
  terDoctrineTypeMapping() or have your custom types implement Type#getMappedDatabaseTypes(). If the type name is empty you migh
  t have a problem with the cache or forgot some mapping information.



also, when i'm typing this comande line :  php bin/console doctrine:schema:validate

i have the following messages :

[Mapping]  FAIL - The entity-class 'Sonata\MediaBundle\Entity\BaseMedia' mapping is invalid:
* The field 'Sonata\MediaBundle\Entity\BaseMedia#providerMetadata' uses a non-existant type 'json'.

[Mapping]  FAIL - The entity-class 'Application\Sonata\MediaBundle\Entity\Media' mapping is invalid:
* The field 'Application\Sonata\MediaBundle\Entity\Media#providerMetadata' uses a non-existant type 'json'.


this is my composer.json :

"require": {
    "php": ">=5.5.9",
    "symfony/symfony": "3.2.*",
    "doctrine/orm": "^2.5",
    "doctrine/doctrine-bundle": "^1.6",
    "doctrine/doctrine-cache-bundle": "^1.2",
    "symfony/swiftmailer-bundle": "^2.3.10",
    "symfony/monolog-bundle": "^3.0.2",
    "symfony/polyfill-apcu": "^1.0",
    "sensio/distribution-bundle": "^5.0",
    "sensio/framework-extra-bundle": "^3.0.2",
    "incenteev/composer-parameter-handler": "^2.0",
    "symfony/intl": "^3",
    "hautelook/alice-bundle": "^1.3",
    "doctrine/doctrine-fixtures-bundle": "^2.3",
    "friendsofsymfony/user-bundle": "~2.0@dev",
    "jms/translation-bundle": "dev-master",
    "jms/i18n-routing-bundle": "dev-master",
    "sonata-project/admin-bundle": "^3.16",
    "sonata-project/doctrine-orm-admin-bundle": "^3.1",
    "sonata-project/media-bundle": "^3.5"
},


Do you know what i'm doing wrong ?

thanks in advance ;)