Validation callback

Hi, I have problem.
I get only callback validation.
Why?

PHP Code:

$this->form_validation->set_rules(
            'user_passcurr',
            'current password',
            'trim|required|min_length[6]|max_length[32]|callback_check_passcurr|strip_tags',
            [
            'required' => 'error0',
            'min_length' => 'error1',
            'max_length' => 'error2',
            ]
        ); 


PHP Code:

    public function check_passcurr(string $str)
    {
        if ($this->user_model->passcurr_verify($this->session->user_id, $str)) {
            return TRUE;
        } else {
            $this->form_validation->set_message('check_passcurr', 'Error {field}');
            return FALSE;
        }
    }