Ошибка при смене статуса заказа

<?php
switch ($modx->event->name) {
    case 'msOnCreateOrder':
	    if($msOrder->get('payment') == 1) {
	        $miniShop2 = $modx->getService('miniShop2');
	        //смена статуса на Оплачен
	        $status_paid = $modx->getOption('ms2_status_paid', null, 2);
	        $miniShop2->changeOrderStatus($msOrder->get('id'), $status_paid);
            }
	break;
}

if ($old_status->get('fixed')) {
                if ($status->get('rank') <= $old_status->get('rank')) {
                    $error = 'ms2_err_status_fixed';
                    return $this->modx->lexicon($error);
                }
            }