Symfony 2.1 FOSFacebookBundle infinite loop after login - loops

Question

I've a little problem with the FOSFacebookBundle integration to my website. When I click on the "Connexion" button, user is redirected to /facebook/login_check, and some random token are added to the url (state and code). But a new value is given to these tokens every second, and the page is still blank.
Here is my code:
[config.yml]
security:
providers:
fos_userbundle:
id: fos_user.user_manager
my_fos_facebook_provider:
id: my.facebook.user
firewalls:
public:
pattern: ^/facebook
fos_facebook:
app_url: "http://www.facebook.com/apps/application.php?id=[MY_APP_ID]"
server_url: "http://localhost/[MY_APP]/app_dev/"
login_path: /facebook/login
check_path: /facebook/login_check
provider: my_fos_facebook_provider
default_target_path: /
anonymous: true
logout:
handlers: ["fos_facebook.logout_handler"]
main:
form_login:
login_path: /login
check_path: /login_check
provider: fos_userbundle
[routing.yml]
_security_check:
pattern: /facebook/login_check
_security_logout:
pattern: /logout
[layout.html.twig]
<script>
function goLogIn(){
window.location.href = "{{ path('_security_check') }}";
}
function onFbInit() {
if (typeof(FB) != 'undefined' && FB != null ) {
FB.Event.subscribe('auth.statusChange', function(response) {
if (response.session || response.authResponse) {
setTimeout(goLogIn, 500);
} else {
window.location.href = "{{ path('fos_user_security_logout') }}";
}
});
}
}
</script>
Do you know why ?
Thanks in advance.
PS: I use Symfony 2.1 and FOSUserBundle.