generating pie charts in php using the libcart package

[k prathapreddy]

for the following code it gives anerror as "Fatal error: Class 'PieChart' not found in C:\xampp\htdocs\n1.php on line 5" even incuding the classes itshows anerror as" Warning: include(C:\xampp\htdocs\libchart\classes): failed to open stream: Permission denied in C:\xampp\htdocs\n1.php on line 3

Warning: include(): Failed opening 'libchart/classes' for inclusion (include_path='.;C:\xampp\php\PEAR') in C:\xampp\htdocs\n1.php on line 3

Fatal error: Class 'PieChart' not found in C:\xampp\htdocs\n1.php on line 4",pls give the solution to fix errors.

<?php
include "libchart/libchart.php";
 
    $chart = new PieChart(500, 250);
 
    $dataSet = new XYDataSet();
    $dataSet->addPoint(new Point("Mozilla Firefox (80)", 80));
    $dataSet->addPoint(new Point("Konqueror (75)", 75));
    $dataSet->addPoint(new Point("Other (50)", 50));
    $chart->setDataSet($dataSet);
 
    $chart->setTitle("User agents for www.example.com");
    $chart->render("generated/demo3.png");
?>