There is no extension able to load the configuration for "facebookbundle" symfony2

Question

I create my own FacebookBundle and I got this error: There is no extension able to load the configuration for "facebookbundle" (in /facebookx/app/config/config_dev.yml). Looked for namespace "facebookbundle", found "framework", "security", "twig", "monolog", "swiftmailer", "assetic", "doctrine", "sensio_framework_extra", "jms_aop", "jms_di_extra", "jms_security_extra", "d_facebook", "d_user", "d_security", "web_profiler", "sensio_distribution" The error message means that I got an entry "facebookbundle" in My config.yml which is not used by any extension ? My config.yml ``` facebookbundle: file: %kernel.root_dir%/../src/FacebookBundle/Facebook/FacebookInit.php alias: facebook app_id: xxx secret: xxx cookie: true permissions: [email, user_birthday, user_location, user_about_me] ``` My DFacebookExtension ``` <?php namespace D\FacebookBundle\DependencyInjection; use Symfony\Component\DependencyInjection\ContainerBuilder; use Symfony\Component\Config\FileLocator; use Symfony\Component\Htt…

Accepted Answer

In order for custom config parameters to be accepted you have to define your bundle configuration using a Configuration.php class within your bundle.

src/FacebookBundle/DependencyInjection/Configuration.php:

```
<?php
namespace FacebookBundle\DependencyInjection;

use Symfony\Component\Config\Definition\Builder\TreeBuilder;
use Symfony\Component\Config\Definition\ConfigurationInterface;

/**
 * This is the class that validates and merges configuration from your app/config files
 *
 * To learn more see {@link http://symfony.com/doc/current/cookbook/bundles/extension.html#cookbook-bundles-extension-config-class}
 */
class Configuration implements ConfigurationInterface
{
    public function getConfigTreeBuilder()
    {
        $treeBuilder = new TreeBuilder();
        $rootNode = $treeBuilder->root('facebookbundle');

$rootNode
            ->children()
                ->scalarNode('file')->defaultValue('')->end()
                ->scalarNode('alias')->defaultValue('')->end()
                ->scalarNode('app_id')->defaultValue('')->end()
                ->scalarNode('secret')->defaultValue('')->end()
                ->booleanNode('cookie')->defaultTrue()->end()
                ->arrayNode('permissions')
                    ->canBeUnset()->prototype('scalar')->end()->end()
            ->end()
            ;

return $treeBuilder;
    }
}
?>
```

There is no extension able to load the configuration for "facebookbundle" symfony2

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