How come I dont see the chart, I only see the word `Chart` when I render my chart?

This is my code:

$strXML .= "<graph formatNumberScale='0' decimalPrecision='0' showvalues='0' animation='1' numdivlines='3' numVdivlines='0' yaxisminvalue='1000' yaxismaxvalue='1800' lineThickness='3'>";
$strXML .= "<categories>";
$i=0;
foreach($statuses as $status){
 $strXML .= "<category name='"  .$status[$i] . "'/>";
$i++;
}
$strXML .= "</categories>";
$i=0;
while($i < count($users)){
 $strXML .= "<dataset seriesname='" . $users[$i] . "'>";
 $a=0;
 while($a < count($count[0])) {
  $strXML .= "<set name='" . $count[$i][a] . "' value='" . $count[$i][a] ."' color='". getFCColor() ."'/>";
  $a++;
 }
 $strXML .= "</dataset>";
 $i++;
}
$strXML .= "</graph>";
echo renderChart("FusionCharts/FCF_Line.swf", "", $strXML, "agentbenchmark",1000, 600);

Can you help me with this?

Good day

Rey Philip Regis
Intermediate PHP Programmer
Cebu City, Philippines