CI 4 Class not found error

I am trying to implement the Repository Pattern in Codeigniter..

this is my file ContactsRepository.php in
App/Repository folder...

use CodeIgniter\Model;
class ContactsRespository extends Model{
...
}

use App\Repository\ContactsRespository;
class Contacts extends Controller
{
public function index()
{
$model = new ContactsModel();

then I got and error!
Class 'App\Repository\ContactsRespository' not found