Не выводятся группы при отображении инф. системы

<?
$InformationSystem = new InformationSystem();
$ids=array(15,16,17,18);
$external_propertys=array();
$property = array();
$property['xml_show_group_type']='all';
$property['OrderField'] = "RAND()";
$InformationSystem->ShowInformationSystem($ids,false,'ПраваяПанель',4,0,$external_propertys,$property);  
?>

<?xml version="1.0" encoding="windows-1251"?>
<document>
<site_user_id>0</site_user_id>
<blocks id="15">
<name>Населению</name>
<description></description>
<url>/naseleniju/</url>
<access>0</access>
<parent_group_id>0</parent_group_id>
<count_items>0</count_items>
<count_items_on_page>10</count_items_on_page>
<count_all_items>0</count_all_items>
<count_groups>0</count_groups>
<count_all_groups>0</count_all_groups>
<tags>
</tags>
<items>
<count_items>0</count_items>
<current_page>0</current_page>
<items_on_page>4</items_on_page>
</items>
<blocks id="18">
<name>Раздел</name>
<description>описание</description>
<url>/about/</url>
<access>0</access>
<parent_group_id>0</parent_group_id>
<count_items>0</count_items>
<count_items_on_page>10</count_items_on_page>
<count_all_items>0</count_all_items>
<count_groups>1</count_groups>
<count_all_groups>1</count_all_groups>
<tags>
</tags>
<items>
<count_items>0</count_items>
<current_page>0</current_page>
<items_on_page>4</items_on_page>
</items>
</blocks>
</document>