Warning: include(library/Session.php): failed to open stream: No such file or directory in D:\xampp\htdocs\rpsu\index.php on line 1

Warning: include(): Failed opening 'library/Session.php' for inclusion (include_path='.;D:\xampp\php\PEAR') in D:\xampp\htdocs\rpsu\index.php on line 1

Fatal error: Class 'Session' not found in D:\xampp\htdocs\rpsu\index.php on line 2