Установка Sylius Fresh: невозможно установить «sensio / generator-bundle»?

Я новичок в Sylius, и я только что установил новый проект Sylius на мой Mac, он работает нормально. Затем я понял, что мне нужно создать свой собственный пакет в src, чтобы перезаписать пакеты Sylius. Обычно я буду использовать «php app / console generate: bundle» для генерации скелета пакета, но «sensio / generator-bundle» не интегрирован с проектом Sylius по умолчанию, поэтому мне нужно сначала установить его через composer, но он кажется, я не мог этого сделать из-за ошибки зависимости, ниже приведен результат ошибки

Problem 1

- Conclusion: don't install sensio/generator-bundle v2.5.1
- Installation request for sensio/generator-bundle ~2.5 -> satisfiable by sensio/generator-bundle[v2.5.0, v2.5.1].
- Conclusion: remove symfony/symfony v2.3.25
- sensio/generator-bundle v2.5.0 requires symfony/console ~2.5 -> satisfiable by symfony/symfony[v2.5.0, v2.5.1, v2.5.10, v2.5.2, v2.5.3, v2.5.4, v2.5.5, v2.5.6, v2.5.7, v2.5.8, v2.5.9, v2.6.0, v2.6.1, v2.6.2, v2.6.3, v2.6.4], symfony/console[v2.5.0, v2.5.1, v2.5.10, v2.5.2, v2.5.3, v2.5.4, v2.5.5, v2.5.6, v2.5.7, v2.5.8, v2.5.9, v2.6.0, v2.6.1, v2.6.2, v2.6.3, v2.6.4].
- don't install symfony/console v2.5.0|don't install symfony/symfony v2.3.25
- don't install symfony/console v2.5.1|don't install symfony/symfony v2.3.25
- don't install symfony/console v2.5.10|don't install symfony/symfony v2.3.25
- don't install symfony/console v2.5.2|don't install symfony/symfony v2.3.25
- don't install symfony/console v2.5.3|don't install symfony/symfony v2.3.25
- don't install symfony/console v2.5.4|don't install symfony/symfony v2.3.25
- don't install symfony/console v2.5.5|don't install symfony/symfony v2.3.25
- don't install symfony/console v2.5.6|don't install symfony/symfony v2.3.25
- don't install symfony/console v2.5.7|don't install symfony/symfony v2.3.25
- don't install symfony/console v2.5.8|don't install symfony/symfony v2.3.25
- don't install symfony/console v2.5.9|don't install symfony/symfony v2.3.25
- don't install symfony/console v2.6.0|don't install symfony/symfony v2.3.25
- don't install symfony/console v2.6.1|don't install symfony/symfony v2.3.25
- don't install symfony/console v2.6.2|don't install symfony/symfony v2.3.25
- don't install symfony/console v2.6.3|don't install symfony/symfony v2.3.25
- don't install symfony/console v2.6.4|don't install symfony/symfony v2.3.25
- Can only install one of: symfony/symfony[v2.5.0, v2.3.25].
- Can only install one of: symfony/symfony[v2.5.1, v2.3.25].
- Can only install one of: symfony/symfony[v2.5.10, v2.3.25].
- Can only install one of: symfony/symfony[v2.5.2, v2.3.25].
- Can only install one of: symfony/symfony[v2.5.3, v2.3.25].
- Can only install one of: symfony/symfony[v2.5.4, v2.3.25].
- Can only install one of: symfony/symfony[v2.5.5, v2.3.25].
- Can only install one of: symfony/symfony[v2.5.6, v2.3.25].
- Can only install one of: symfony/symfony[v2.5.7, v2.3.25].
- Can only install one of: symfony/symfony[v2.5.8, v2.3.25].
- Can only install one of: symfony/symfony[v2.5.9, v2.3.25].
- Can only install one of: symfony/symfony[v2.6.0, v2.3.25].
- Can only install one of: symfony/symfony[v2.6.1, v2.3.25].
- Can only install one of: symfony/symfony[v2.6.2, v2.3.25].
- Can only install one of: symfony/symfony[v2.6.3, v2.3.25].
- Can only install one of: symfony/symfony[v2.6.4, v2.3.25].
- Installation request for symfony/symfony == 2.3.25.0 -> satisfiable by symfony/symfony[v2.3.25].

Ниже мой composer.json (новая установка)

{
"name":        "sylius/sylius-standard",
"description": "Sylius SE, modern e-commerce solution for Symfony2",
"keywords":    ["symfony", "symfony2", "sylius", "distribution", "ecommerce", "cart"],
"type":        "project",
"license":     "MIT",
"homepage":    "http://sylius.org",
"authors": [
{
"name":     "Paweł Jędrzejewski",
"homepage": "http://pjedrzejewski.com"},
{
"name":     "Sylius project",
"homepage": "http://sylius.org"},
{
"name":     "Community contributions",
"homepage": "http://github.com/Sylius/Sylius/contributors"}
],
"require": {
"php":                                  ">=5.3.3",
"sylius/sylius":                        "0.12.*@dev",

"doctrine/doctrine-bundle":             "@dev",
"doctrine/migrations":                  "@dev",
"doctrine/doctrine-migrations-bundle":  "@dev",
"friendsofsymfony/user-bundle":         "@dev",
"knplabs/knp-gaufrette-bundle":         "@dev",
"knplabs/knp-snappy-bundle":            "@dev",
"liip/doctrine-cache-bundle":           "@dev",
"mathiasverraes/money":                 "@dev",
"pagerfanta/pagerfanta":                "@dev",
"white-october/pagerfanta-bundle":      "@dev",
"friendsofsymfony/oauth-server-bundle": "@dev",
"willdurand/hateoas-bundle":            "1.0.*@dev",
"jms/serializer-bundle":                "0.13.*@dev",
"friendsofsymfony/rest-bundle":         "~1.5@dev"},
"require-dev": {
"behat/behat":                       "~3.0",
"behat/symfony2-extension":          "~2.0@dev",
"behat/mink-extension":              "~2.0@dev",
"behat/mink-browserkit-driver":      "~1.2@dev",
"behat/mink-selenium2-driver":       "@dev",
"behat/mink":                        "~1.6@dev",
"doctrine/doctrine-fixtures-bundle": "2.2.*",
"fzaninotto/faker":                  "~1.2",
"phpspec/phpspec":                   "~2.0",
"phpunit/phpunit":                   "~3.7"},
"scripts": {
"post-install-cmd": [
"Incenteev\\ParameterHandler\\ScriptHandler::buildParameters",
"Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::buildBootstrap",
"Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::clearCache",
"Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::installAssets",
"Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::installRequirementsFile",
"Symfony\\Cmf\\Bundle\\CreateBundle\\Composer\\ScriptHandler::downloadCreate"],
"post-update-cmd": [
"Incenteev\\ParameterHandler\\ScriptHandler::buildParameters",
"Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::buildBootstrap",
"Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::clearCache",
"Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::installAssets",
"Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::installRequirementsFile",
"Symfony\\Cmf\\Bundle\\CreateBundle\\Composer\\ScriptHandler::downloadCreate"]
},
"autoload": {
"psr-0": {
"": "src/",
"Context": "features/"}
},
"config": {
"bin-dir": "bin"},
"extra": {
"symfony-app-dir": "app",
"symfony-web-dir": "web",
"incenteev-parameters": {
"file": "app/config/parameters.yml"}
}
}

Можно ли установить генераторный комплект или есть другой способ создать комплект?

Спасибо