Warning: require_once(C:\xampp\htdocs\libraries\loader.php) [function.require-once]: failed to open stream: No such file or directory in C:\xampp\htdocs\libraries\joomla\import.php on line 21

Fatal error: require_once() [function.require]: Failed opening required 'C:\xampp\htdocs\libraries\loader.php' (include_path='.;\xampp\php\PEAR') in C:\xampp\htdocs\libraries\joomla\import.php on line 21