Laravel 5.1分组路由，资源控制器不工作

Question

我在Laravel 5.1中有一个分组路线，以便发布＆＃39;声明＆＃39;在＆＃39; admin＆＃39;。当我访问http://app.local/announcement时，一切正常，我得到了＃hello＆＃39;。但是，当我访问http://app.local/admin/announcement时，我什么都没得到。没有错误 - 只是一个空白的屏幕。

任何想法??

routes.php文件：

//Admin controller.
Route::resource('admin', 'AdminController');
//Route for admin/announcement
Route::group(['prefix' => 'admin'], function () {
    Route::resource('announcement', 'AnnouncementController');
});
//Test route.
Route::resource('announcement', 'AnnouncementController');

我的公告控制人：

class AnnouncementController extends Controller
{
    public function index()
    {
        return dd('hello');
    }
}

PHP artisan route：list（相关部分）：

|        | GET|HEAD                       | admin/announcement                                   | admin.announcement.index   | App\Http\Controllers\AnnouncementController@index                         |                         |
|        | POST                           | admin/announcement                                   | admin.announcement.store   | App\Http\Controllers\AnnouncementController@store                         |                         |
|        | GET|HEAD                       | admin/announcement/create                            | admin.announcement.create  | App\Http\Controllers\AnnouncementController@create                        |                         |
|        | PATCH                          | admin/announcement/{announcement}                    |                            | App\Http\Controllers\AnnouncementController@update                        |                         |
|        | DELETE                         | admin/announcement/{announcement}                    | admin.announcement.destroy | App\Http\Controllers\AnnouncementController@destroy                       |                         |
|        | PUT                            | admin/announcement/{announcement}                    | admin.announcement.update  | App\Http\Controllers\AnnouncementController@update                        |                         |
|        | GET|HEAD                       | admin/announcement/{announcement}                    | admin.announcement.show    | App\Http\Controllers\AnnouncementController@show                          |                         |
|        | GET|HEAD                       | admin/announcement/{announcement}/edit               | admin.announcement.edit    | App\Http\Controllers\AnnouncementController@edit                          |                         |
|        | GET|HEAD                       | announcement                                         | announcement.index         | App\Http\Controllers\AnnouncementController@index                         |                         |
|        | POST                           | announcement                                         | announcement.store         | App\Http\Controllers\AnnouncementController@store                         |                         |
|        | GET|HEAD                       | announcement/create                                  | announcement.create        | App\Http\Controllers\AnnouncementController@create                        |                         |
|        | PATCH                          | announcement/{announcement}                          |                            | App\Http\Controllers\AnnouncementController@update                        |                         |
|        | DELETE                         | announcement/{announcement}                          | announcement.destroy       | App\Http\Controllers\AnnouncementController@destroy                       |                         |
|        | GET|HEAD                       | announcement/{announcement}                          | announcement.show          | App\Http\Controllers\AnnouncementController@show                          |                         |
|        | PUT                            | announcement/{announcement}                          | announcement.update        | App\Http\Controllers\AnnouncementController@update                        |                         |
|        | GET|HEAD                       | announcement/{announcement}/edit                     | announcement.edit          | App\Http\Controllers\AnnouncementController@edit                          |                         |

非常感谢， 史蒂夫