Warning: include_once(library.php): failed to open stream: No such file or directory in H:\Apache24\htdocs\test4\5\example5-7.php on line 2

Warning: include_once(): Failed opening 'library.php' for inclusion (include_path='.;C:\php\pear') in H:\Apache24\htdocs\test4\5\example5-7.php on line 2