Editar un proyecto existente de Symfony2

[Drummer]

Gracias por el consejo.

Lo hice y ejecuté composer.phat install, y aún me da errores:

Código:

Loading composer repositories with package information
Initializing PEAR repository http://pear.phing.info
Installing dependencies
Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - Installation request for cedriclombardot/admingenerator-generator-bundle dev-master -> satisfiable by cedriclombardot/admingenerator-generator-bundle dev-master.
    - Conclusion: don't install symfony/symfony 2.1.x-dev
    - Installation request for sensio/generator-bundle dev-master -> satisfiable by sensio/generator-bundle dev-master.
    - cedriclombardot/admingenerator-generator-bundle dev-master requires symfony/symfony 2.1.* -> satisfiable by symfony/symfony 2.1.x-dev, symfony/symfony v2.1.0, symfony/symfony v2.1.0-BETA1, symfony/symfony v2.1.0-BETA2, symfony/symfony v2.1.0-BETA3, symfony/symfony v2.1.0-BETA4, symfony/symfony v2.1.0-RC1, symfony/symfony v2.1.0-RC2, 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.
    - Can only install one of: symfony/symfony v2.1.0, symfony/symfony 2.2.x-dev.
    - Can only install one of: symfony/symfony v2.1.0-BETA1, symfony/symfony 2.2.x-dev.
    - Can only install one of: symfony/symfony v2.1.0-BETA2, symfony/symfony 2.2.x-dev.
    - Can only install one of: symfony/symfony v2.1.0-BETA3, symfony/symfony 2.2.x-dev.
    - Can only install one of: symfony/symfony v2.1.0-BETA4, symfony/symfony 2.2.x-dev.
    - Can only install one of: symfony/symfony v2.1.0-RC1, symfony/symfony 2.2.x-dev.
    - Can only install one of: symfony/symfony v2.1.0-RC2, symfony/symfony 2.2.x-dev.
    - Can only install one of: symfony/symfony v2.1.1, symfony/symfony 2.2.x-dev.
    - Can only install one of: symfony/symfony v2.1.2, symfony/symfony 2.2.x-dev.
    - Can only install one of: symfony/symfony v2.1.3, symfony/symfony 2.2.x-dev.
    - Can only install one of: symfony/symfony v2.1.4, symfony/symfony 2.2.x-dev.
    - Can only install one of: symfony/symfony v2.1.5, symfony/symfony 2.2.x-dev.
    - Can only install one of: symfony/symfony v2.1.6, symfony/symfony 2.2.x-dev.
    - sensio/generator-bundle dev-master requires symfony/framework-bundle 2.2.* -> satisfiable by symfony/symfony 2.2.x-dev, symfony/framework-bundle 2.2.x-dev.
    - Conclusion: don't install symfony/framework-bundle 2.2.x-dev

Si puedes, dime por que manual me puedo guiar, pq el que estaba usando "Desarrollo Agil" se me queda pequeño. El que mencioné antes vale?

Gracias de nuevo.