在捆绑包中创建配置参数时出错

当我想为捆绑包创建配置参数时，我收到了这个错误。

Symfony''Component''DependencyInjection''Exception''InvalidArgumentException]没有扩展能够加载的配置"mrc_morales_tyre"

这是代码：

app/config/config.yml

mrc_morales_tyre:
    db_driver: orm 

配置.php

    namespace MrcMorales'TyreBundle'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
    {
        /**
         * {@inheritdoc}
         */
        public function getConfigTreeBuilder()
        {
            $treeBuilder = new TreeBuilder();
            $rootNode = $treeBuilder->root('mrc_morales_tyre');
            $supportedDrivers = array('orm');
            $rootNode
                ->children()
                    ->scalarNode('db_driver')
                        ->validate()
                            ->ifNotInArray($supportedDrivers)
                            ->thenInvalid('The driver %s is not supported. Please choose one of '.json_encode($supportedDrivers))
                        ->end()
                    ->end()
                ->end();
            return $treeBuilder;        
}
}

TyreExtension.php

namespace MrcMorales'TyreBundle'DependencyInjection;
use Symfony'Component'DependencyInjection'ContainerBuilder;
use Symfony'Component'Config'FileLocator;
use Symfony'Component'HttpKernel'DependencyInjection'Extension;
use Symfony'Component'DependencyInjection'Loader;
use Symfony'Component'Config'Definition'Processor;

/**
 * This is the class that loads and manages your bundle configuration
 *
 * To learn more see {@link http://symfony.com/doc/current/cookbook/bundles/extension.html}
 */
class TyreExtension 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'));
    }
}

TyreBundle.php

namespace MrcMorales'TyreBundle;
use Symfony'Component'HttpKernel'Bundle'Bundle;
use Symfony'Component'DependencyInjection'ContainerBuilder;
use MrcMorales'TyreBundle'DependencyInjection'Compiler'ValidationPass;
class TyreBundle extends Bundle
{
    public function build(ContainerBuilder $container)
    {
        parent::build($container);
        $container->addCompilerPass(new ValidationPass());
    }
}

ValidationPass是在不常用的文件夹中加载validation.yml，它可以工作。

感谢