No errors in console after registering a library with Silex
===

I tryed to add FormServiceProvider library to my bootstrap.
I had to download it because it wasn't in "light" Silex Framework version.

So I put it in my library
(Here's the structure)

    Sources
       --- private
          --- application
             --- controllers
             bootstrap.php
          --- data
          --- libraries
             --- Silex
                --- Provider
                       FormServiceProvider.php
                       SessionServiceProvider.php
                       ...
                silex.phar
             --- Swift
             --- Symfony
             --- ...

(I have all the dependencies needed)

    require __DIR__.'/../libraries/Silex/Provider/FormServiceProvider.php';
    $app->register(
         new libraries\Silex\Provider\FormServiceProvider(),
         array('form.class_path' => __DIR__ . '/../libraries',
    ));

When I add that code to register FormServiceProvider, every pages of my website turn blank and nothing is loaded but the bootstrap before this line.

After some testing, I found that the error is in this line

    new libraries\Silex\Provider\FormServiceProvider()

(Just doing a print_r(new libraries\Silex\Provider\FormServiceProvider()) does the same error).

But nothing appears in the console and I don't know what's wrong. I tryed modifying my error level to see if something appeared, but nothing.

Thanks for any help.