如何在Laravel 5中访问admin控制器

我想从admin文件夹访问admin控制器，但我有一些麻烦让这个工作。

routes.php

Route::group(array('namespace' => 'admin', 'prefix' => 'admin'), function() {
  Route::resource('ideas', 'AdminIdeaController');
});

AdminIdeaController.php

<?php namespace App'Http'Controllers'Admin;
use App'Http'Controllers'Controller;
use Session;
use DB;
use Route;
use User;
use Hash;
use Auth;
use Input;
use Logout;
use Validator;
use Authenticatable;
use Redirect;
use Illuminate'Http'Request;
class AdminIdeaController extends BaseController
{
    public function index()
    {
        $data['idas'] = DB::table('ideas')
            ->get();

        return View('/admin/ideas.view',$data);
    }
}

文件夹路径:

Http
    Controllers
        Admin
            AdminIdeaController .php

ReflectionException in Container.php line 736:
Class App'Http'Controllers'AdminIdeaController does not exist

请帮助我如何路由这个文件夹文件。

谢谢。