установить сонату электронной коммерции ОШИБКА

Я пытаюсь установить сонату в моем проекте Symfony.

Я мой composer.jso я добавляю:

"require": {
"php": ">=5.3.3",
"symfony/symfony": "2.6.*",
"doctrine/orm": "~2.2,>=2.2.3",
"doctrine/doctrine-bundle": "~1.2",
"twig/extensions": "~1.0",
"symfony/assetic-bundle": "~2.3",
"symfony/swiftmailer-bundle": "~2.3",
"symfony/monolog-bundle": "~2.4",
"sensio/distribution-bundle": "~3.0",
"sensio/framework-extra-bundle": "~3.0",
"incenteev/composer-parameter-handler": "~2.0",
"genemu/form-bundle": "2.2.*",
"sonata-project/ecommerce": "2.3@dev"},

Я делаю следующую команду: обновление композитора

Loading composer repositories with package information
Updating dependencies (including require-dev)
Your requirements could not be resolved to an installable set of packages.

Problem 1
- The requested package sonata-project/ecommerce could not be found in any version, there may be a typo in the package name.

Potential causes:
- A typo in the package name
- The package is not available in a stable-enough version according to your minimum-stability setting
see <https://groups.google.com/d/topic/composer-dev/_g3ASeIFlrc/discussion> for more details.

Read <http://getcomposer.org/doc/articles/troubleshooting.md> for further common problems.

Кто-то знает почему?

Спасибо
С наилучшими пожеланиями