Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - Conclusion: remove symfony/symfony v2.1.9
    - Conclusion: don't install symfony/symfony v2.1.9
    - Conclusion: don't install symfony/symfony v2.1.8
    - Conclusion: don't install symfony/symfony v2.1.7
    - Conclusion: don't install symfony/symfony v2.1.6
    - Conclusion: don't install symfony/symfony v2.1.5
    - Conclusion: don't install symfony/symfony v2.1.4
    - Conclusion: don't install symfony/symfony v2.1.3
    - Conclusion: don't install symfony/symfony v2.1.2
    - Conclusion: don't install symfony/symfony v2.1.1
    - sonata-project/intl-bundle dev-master requires symfony/locale 2.2.* -> satisfiable by symfony/symfony v2.2.0, symfony/symfony v2.2.1, symfony/locale v2.2.0, symfony/locale v2.2.1.
    - sonata-project/intl-bundle dev-master requires symfony/locale 2.2.* -> satisfiable by symfony/symfony v2.2.0, symfony/symfony v2.2.1, symfony/locale v2.2.0, symfony/locale v2.2.1.
    - Can only install one of: symfony/symfony v2.2.0, symfony/symfony v2.1.0.
    - Can only install one of: symfony/symfony v2.2.1, symfony/symfony v2.1.0.
    - don't install symfony/locale v2.2.0|don't install symfony/symfony v2.1.0
    - don't install symfony/locale v2.2.1|don't install symfony/symfony v2.1.0
    - Installation request for symfony/symfony 2.1.* -> satisfiable by symfony/symfony v2.1.0, symfony/symfony v2.1.1, symfony/symfony v2.1.2, symfony/symfony v2.1.3, symfony/symfony v2.1.4, symfony/symfony v2.1.5, symfony/symfony v2.1.6, symfony/symfony v2.1.7, symfony/symfony v2.1.8, symfony/symfony v2.1.9.
    - Installation request for sonata-project/intl-bundle dev-master -> satisfiable by sonata-project/intl-bundle dev-master.