Instalacion Symfony: me faltan DLLs !!!

[Italico76]

D:\xampp\htdocs\sf_sandbox>symfony generate:app helloworld

>> dir+ D:\xampp\htdocs\sf_sandbox\apps/helloworld\config
>> file+ D:\xampp\htdocs\sf_sandbox\apps/helloworld\config/app.yml
>> file+ D:\xampp\htdocs\sf_sandbox\apps...licationConfigur ation.class.php
>> file+ D:\xampp\htdocs\sf_sandbox\apps/helloworld\config/cache.yml
>> file+ D:\xampp\htdocs\sf_sandbox\apps/helloworld\config/factories.yml
>> file+ D:\xampp\htdocs\sf_sandbox\apps/helloworld\config/filters.yml
>> file+ D:\xampp\htdocs\sf_sandbox\apps/helloworld\config/routing.yml
>> file+ D:\xampp\htdocs\sf_sandbox\apps/helloworld\config/security.yml
>> file+ D:\xampp\htdocs\sf_sandbox\apps/helloworld\config/settings.yml
>> file+ D:\xampp\htdocs\sf_sandbox\apps/helloworld\config/view.yml
>> dir+ D:\xampp\htdocs\sf_sandbox\apps/helloworld\i18n
>> dir+ D:\xampp\htdocs\sf_sandbox\apps/helloworld\lib
>> file+ D:\xampp\htdocs\sf_sandbox\apps/helloworld\lib/myUser.class.php
>> dir+ D:\xampp\htdocs\sf_sandbox\apps/helloworld\modules
>> dir+ D:\xampp\htdocs\sf_sandbox\apps/helloworld\templates
>> file+ D:\xampp\htdocs\sf_sandbox\apps/helloworld\templates/layout.php
>> tokens D:/xampp/htdocs/sf_sandbox/apps/helloworld/config/settings.yml
>> file+ D:\xampp\htdocs\sf_sandbox\web/helloworld.php
(...)

OK, y ahora que ? como se supone que corro la aplicacion ?

Vi que creo esto:

http://localhost/sf_sandbox/apps/helloworld/

Si voy a http://localhost/sf_sandbox/helloworld/helloworld.php me pasa esto:

Warning: require_once(D:\xampp\htdocs\sf_sandbox\helloworld/sf20/autoload2/sfCore2Autoload.class.php) [function.require-once]: failed to open stream: No such file or directory in D:\xampp\htdocs\sf_sandbox\helloworld\helloworld.p hp on line 2

Fatal error: require_once() [function.require]: Failed opening required 'D:\xampp\htdocs\sf_sandbox\helloworld/sf20/autoload2/sfCore2Autoload.class.php' (include_path='.;D:\xampp\php\pear\') in D:\xampp\htdocs\sf_sandbox\helloworld\helloworld.p hp on line 2

La idea es probar el ejemplo.... del HelloWorld de http://fabien.potencier.org/media/ta...-symfony-2.pdf