Class 'yidas\rest\Controller' not found

[owf18916]

This error occured when i hit the api
this is my controller :

<?php
defined('BASEPATH') OR exit('No direct script access allowed');

use yidas\rest\Controller;

class PostApiController extends Controller
{
    public function index()
    {
        return $this->response->json(['bar'=>'foo']);
    }
}