validate form CI4

"Argument 1 passed to helper() must be of the type string, array given, called in C:\xampp\htdocs\ci4m_framework\application\Controllers\Login.php on line 10"
line 10 -> helper(['form', 'url']);
my source:
    public function index()
    {
        //echo view('w_login');
                $validation =  \Config\Services::validation();
                helper(['form', 'url']);
                //library(['validation']);
                
//                
//                
//                
//                
//                
//                
//                $validation->setRules([
//    'id' => 'required',
//    'pw' => 'required|min_length[10]'
//]);
//                
                if (! $this->validate([]))
                {
                        echo view('w_login', [
                                'validation' => $this->validation
                        ]);
                }
                else
                {
                        echo view('w_login');
                }
                
    }