错误尝试在Controller中包含PrestaShopWebService

Question

我正在尝试在控制器中包含prestashop的web服务库，但是当我尝试包含这个类时，我得到了下一个错误：

Attempted to load class "PrestaShopWebService2" from namespace "AppBundle\Services".
Did you forget a "use" statement for another namespace? 

Prestashop v1.5.6

PrestaShopWebService2：

namespace AppBundle\Services;
class PrestaShopWebService2
{//code}

DefaultController：

use AppBundle\Services\PrestaShopWebService2;
public function indexAction()
    {
        //code
        $persta2 = new PrestaShopWebService2("MyURL","mykey", false);
        //code
    }

问题出在哪里？