composer.json

{
    "name": "symfony/framework-standard-edition",
    "license": "MIT",
    "type": "project",
    "description": "The \"Symfony Standard Edition\" distribution",
    "autoload": {
        "psr-0": { "": "src/" }
    },
    "require": {
        "php": ">=5.3.3",
        "symfony/symfony": "~2.4",
        "symfony/icu": "1.0.*",
        "doctrine/orm": "~2.4",
        "doctrine/migrations": "dev-master",
        "doctrine/doctrine-migrations-bundle": "dev-master",
        "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": "~2.3",
        "sensio/framework-extra-bundle": "~2.3",
        "sensio/generator-bundle": "~2.3",
        "incenteev/composer-parameter-handler": "~2.0",
        "friendsofsymfony/user-bundle": "~1.3",
        "sonata-project/user-bundle": "2.2.*@dev",
        "knplabs/knp-menu-bundle" : "1.1.*",
        "sonata-project/admin-bundle": "2.2.*@dev",
        "sonata-project/doctrine-orm-admin-bundle": "2.2.*@dev",
        "sonata-project/easy-extends-bundle": "2.1.*@dev",
        "doctrine/doctrine-fixtures-bundle": "dev-master",
        "friendsofsymfony/jsrouting-bundle": "1.4.*",
        "sonata-project/core-bundle": "~2.2@dev",
        "oh/google-map-form-type-bundle": "dev-master",
        "jms/serializer-bundle": "0.13.*",
        "friendsofsymfony/rest-bundle": "1.1.*",
        "leaseweb/api-caller-bundle": "1.1.*"
    },
    "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"
        ],
        "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"
        ]
    },
    "config": {
        "bin-dir": "bin"
    },
    "minimum-stability": "stable",
    "extra": {
        "symfony-app-dir": "app",
        "symfony-web-dir": "web",
        "incenteev-parameters": {
            "file": "app/config/parameters.yml"
        },
        "branch-alias": {
            "dev-master": "2.4-dev"
        }
    }
}

gistfile1.txt

  Problem 1
    - Installation request for symfony/framework-standard-edition 2.4.x-dev -> satisfiable by symfony/framework-standard-edition[2.4.x-dev].
    - symfony/framework-standard-edition 2.4.x-dev requires sonata-project/admin-bundle 2.2.*@dev -> no matching package found.

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.