how to access semantic configuration in a controller with symfony2?

I'm following "How to expose a Semantic Configuration for a Bundle" official manual for symfony 2. I have my configuration.php ``` namespace w9\UserBundle\DependencyInjection; use Symfony\Component\Config\Definition\Builder\TreeBuilder; use Symfony\Component\Config\Definition\ConfigurationInterface; class Configuration implements ConfigurationInterface { /** * {@inheritDoc} */ public function getConfigTreeBuilder() { $treeBuilder = new TreeBuilder(); $rootNode = $treeBuilder->root('w9_user'); $rootNode ->children() ->scalarNode('logintext')->defaultValue('Zareejstruj się')->end() ->end() ; return $treeBuilder; } } ``` And w9UserExtension.php: ``` namespace w9\UserBundle\DependencyInjection; use Symfony\Component\DependencyInjection\ContainerBuilder; use Symfony\Component\Config\FileLocator; use Symfony\Component\HttpKernel\DependencyInjection\Extension; use Symfony\Component\DependencyInjection\Loader; class w9UserExtension extends Extension { /** * {@inheritDoc} */ public function load(array $configs, ContainerBuilder $container) { $configuration = new Configuration(); $config = $this->processConfiguration($configuration, $configs); $loader = new Loader\YamlFileLoader($container, new FileLocator(__DIR__.'/../Resources/config')); $loader->load('services.yml'); } } ``` It may sounds silly, but I'm not able to find the way, how to access logintext parameter in controller? ``` $logintext = $this->container->getParameter("w9_user.logintext"); ``` does not work. What I'm doing wrong?