【求助】Laravel|01-16：Session store not set on request.

5.2的报这个错！
控制器代码：
<?php
namespace App\Http\Controllers;
use DB;
use Session;
use Illuminate\Http\Request;
use App\Http\Controllers\Controller;
class AdminController extends Controller
{
public function login(Request $request)
{
$request->session()->put('wawcuser', '111');
return $request->session()->get('wawcuser');
}
}