Google Caledar Error

Having extrated then place in the root folder of mine, I get the following error:

Warning: require(C:/xampp/htdocs/add2gcal/_classes/Autoloader.class.php): failed to open stream: No such file or directory in C:\xampp\htdocs\jumatrials\calendar\test.php on line 7

Fatal error: require(): Failed opening required 'C:/xampp/htdocs/add2gcal/_classes/Autoloader.class.php' (include_path='.;C:\xampp\php\PEAR') in C:\xampp\htdocs\jumatrials\calendar\test.php on line 7

What can be the cause??

These are the problem lines

define("APP_PATH",$_SERVER['DOCUMENT_ROOT'].'/add2gcal/');
require(APP_PATH . '_classes/Autoloader.class.php');

It seems you put the test file in to /calendar/test.php and not add2gcal/test.php. Please update the test.php file for your directory configuration.