symfony - InvalidArgumentException：没有扩展能够在 config_dev.yml 中加载“assetic”的配置

Question

我不知道如何解决这个错误。这是我的 composer.jason ：

{
"name": "symfony/framework-standard-edition",
"description": "The \"Symfony Standard Edition\" distribution",
"autoload": {
    "psr-0": { "": "src/" }
},
"require": {
    "php": ">=5.3.3",
    "symfony/symfony": "2.2.*@dev",
    "symfony/framework-bundle": "2.2.*@dev",
    "doctrine/orm": ">=2.2.3,<2.4-dev",
    "doctrine/doctrine-bundle": "dev-master",
    "twig/extensions": "1.0.*@dev",
    "doctrine/data-fixtures": "dev-master",
    "doctrine/doctrine-fixtures-bundle": "dev-master",
    "stof/doctrine-extensions-bundle": "dev-master",
    "friendsofsymfony/user-bundle": "2.0.*dev",
    "symfony/swiftmailer-bundle": "2.1.*",
    "symfony/monolog-bundle": "2.1.*",
    "kriswallsmith/assetic": "1.1.*@dev"
},
"scripts": {
    "post-install-cmd": [
        "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::buildBootstrap",
        "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::clearCache",
        "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::installAssets",
        "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::installRequirementsFile"
    ],
    "post-update-cmd": [
        "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::buildBootstrap",
        "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::clearCache",
        "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::installAssets",
        "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::installRequirementsFile"
    ]
},
"extra": {
    "symfony-app-dir": "app",
    "symfony-web-dir": "web"
}

}

这是我的 Appkernel.php ：

 class AppKernel extends Kernel
{
public function registerBundles()
{
    $bundles = array(
        new Symfony\Bundle\FrameworkBundle\FrameworkBundle(),
        new Symfony\Bundle\SecurityBundle\SecurityBundle(),
        new Symfony\Bundle\TwigBundle\TwigBundle(),
        new Symfony\Bundle\MonologBundle\MonologBundle(),
        new Symfony\Bundle\SwiftmailerBundle\SwiftmailerBundle(),
        new Symfony\Bundle\AsseticBundle\AsseticBundle(),
        new Doctrine\Bundle\DoctrineBundle\DoctrineBundle(),
        new Sdz\BlogBundle\SdzBlogBundle(),
        new Sdz\UserBundle\SdzUserBundle(),
        new Stof\DoctrineExtensionsBundle\StofDoctrineExtensionsBundle(),
        new FOS\UserBundle\FOSUserBundle(),
        new Ma\L4cBundle\MaL4cBundle(),
    );

    if (in_array($this->getEnvironment(), array('dev', 'test'))) {
        $bundles[] = new Symfony\Bundle\WebProfilerBundle\WebProfilerBundle();
        //$bundles[] = new Sensio\Bundle\DistributionBundle\SensioDistributionBundle();
        //$bundles[] = new Sensio\Bundle\GeneratorBundle\SensioGeneratorBundle();
        $bundles[] = new Doctrine\Bundle\FixturesBundle\DoctrineFixturesBundle();
    }

    return $bundles;
}

public function registerContainerConfiguration(LoaderInterface $loader)
{
    $loader->load(__DIR__.'/config/config_'.$this->getEnvironment().'.yml');
}

}

我知道 symfony 捆绑包有内部资产类，所以我认为可能与 kriswallsmith 资产存在冲突。