Tree Grid Problem

Tree Grid Problem

I am at a loss. After 2 days of searching and trying, I can't get a Tree Grid to display. I get the column layout but not data. Any ideas to help this newbie?
 
my js:
jQuery("#gridPeople").jqGrid({
    treeGrid: true,
    treeGridModel: 'adjacency',
 


 url:'data/people_995.xml' ,
  datatype: "xml",
    ExpandColumn : 'Subjectname',
 height: 'auto',
// hiddengrid: true,
    colNames:['Subject','measure','Week', 'MTD', 'QTD','YTD'],
 viewRecords:true,
    colModel:[
     {name:'Subjectname',index:'Subjectname', width:140},
     {name:'SubSubjectName',index:'SubSubjectName', width:140, align:'right'},
     {name:'WTD',index:'WTD', width:60, align:'center', sorttype:'float',formatter:'PointFmatter'},
     {name:'MTD',index:'MTD', width:60, align:'center', sorttype:'float',formatter:'PointFmatter'},
     {name:'QTD',index:'QTD', width:60, align:'center', sorttype:'float',formatter:'PointFmatter'},
     {name:'YTD',index:'YTD', width:60, align:'center', sorttype:'float',formatter:'PointFmatter'}
    ],
 <cfoutput>
    caption: "<img  src='#clrOrange#'/><span style='margin-left:20px'>People</span>"
 </cfoutput>
});
 
And my XML file:
<?xml version="1.0"?>
 <Rows>
 <page>1</page>
 <total>1</total>
 <records>1</records>
 <Row id="1">
  <Subjectname>Motor Vehicle Incidents</Subjectname>
  <SubSubjectName> </SubSubjectName>
  <WTD>70</WTD>
  <MTD>75</MTD>
  <QTD>80</QTD>
  <YTD >81</YTD>
  <level>0</level>
  <parent></parent>
  <isLeaf>false</isLeaf>
  <expanded>false</expanded>
    </Row>
    <Row id="2">
  <Subjectname>Motor Vehicle Incidents</Subjectname>
  <SubSubjectName>Motor Vehicle Incidents</SubSubjectName>
  <WTD>0</WTD>
  <MTD>0</MTD>
  <QTD>0</QTD>
  <YTD>0</YTD>
  <level>1</level>
  <parent>1</parent>
  <isLeaf>true</isLeaf>
  <expanded>false</expanded>
    </Row>
    <Row id="3">
  <Subjectname>OSHA Incidents</Subjectname>
  <SubSubjectName/>
  <WTD>0</WTD>
  <MTD>0</MTD>
  <QTD>0</QTD>
  <YTD>0</YTD>
  <level>0</level>
  <parent></parent>
  <isLeaf>false</isLeaf>
  <expanded>false</expanded>
    </Row>
    <Row  id="4">
  <Subjectname>OSHA Incidents</Subjectname>
  <SubSubjectName>OSHA Incidents</SubSubjectName>
  <WTD>0</WTD>
  <MTD>0</MTD>
  <QTD>0</QTD>
  <YTD>0</YTD>
  <level>1</level>
  <parent>3</parent>
  <isLeaf>true</isLeaf>
  <expanded>false</expanded>
    </Row>
    <Row  id="5">
  <Subjectname>Vacant Rate F1, 2B, 4</Subjectname>
  <SubSubjectName/>
  <WTD>0</WTD>
  <MTD>0</MTD>
  <QTD>0</QTD>
  <YTD>0</YTD>
  <level>0</level>
  <parent></parent>
  <isLeaf>false</isLeaf>
  <expanded>false</expanded>
    </Row>
    <Row id="6">
  <Subjectname>Vacant Rate F1, 2B, 4</Subjectname>
  <SubSubjectName>Vacant Rate F1, 2B, 4</SubSubjectName>
  <WTD>0</WTD>
  <MTD>0</MTD>
  <QTD>0</QTD>
  <YTD>0</YTD>
  <level>1</level>
  <parent>5</parent>
  <isLeaf>true</isLeaf>
  <expanded>false</expanded>
    </Row>
</Rows>