为什么我的控制器不工作，而是抛出文件加载器异常

我已经设置了一个新的控制器，当我运行时

./app/console router:debug

我收到错误：

[Symfony'Component'Config'Exception'FileLoaderLoadException]                                                                                                                                               
  Cannot import resource "/home/dev/Workspace/src/Hn/AssetDbBundle/Controller/" from "/home/dev/Workspace/app/config/routing.yml". ([Syntax Error] Expected PlainValue, got ''' at position 26 in method Hn'AssetDbBundle'Controller'Component'UnsupportedBrowserController::renderUnsupportedBrowserMessageAction().)

我的控制器如下所示：

<?php
namespace Hn'AssetDbBundle'Controller'Component;
use Sensio'Bundle'FrameworkExtraBundle'Configuration'Template;
use Symfony'Bundle'FrameworkBundle'Controller'Controller;
use Symfony'Component'Routing'Annotation'Route;
/**
 * Class UnsupportedBrowserController
 * @Route("/_internal/browser/", name="component_browser")
 * 
 */
class UnsupportedBrowserController extends Controller
{
    /**
     * @Template()
     * @Route('unsupported')
     */
    public function renderUnsupportedBrowserMessageAction()
    {
        return [];
    }
}