Call to undefined method Illuminate\Session\Store::set()

public function redirect()
{
    $state = null;

    if ($this->usesState()) {
        $this->request->session()->set('state', $state = $this->getState());
    }

    return new RedirectResponse($this->getAuthUrl($state));
}

在做微信获取用户openid ，按着 http://www.jianshu.com/p/9be317865c9e 这个教程配置的，现在遇到题目的错误，
报错 set()未定义，有解决的方案吗