报错Class 'think\Facade\Request' not found

<?php

namespace app\index\controller;

use app\common\controller\Base;

use app\common\model\Article;

use app\common\model\Cate;

use think\Facade\Request;

$cateId = Request::param('cate_id');

    // dump($cateId);die;

    if(isset($cateId)){

    $res = Cate::get($cateId);

    $this -> view -> assign('cateName',$res->name);

    }

报错：Class 'think\Facade\Request' not found

Class 'think\Facade\Request' not found

Class 'think\Facade\Request' not found

Class 'think\Facade\Request' not found