Warning: require_once(library.php): failed to open stream: No such file or directory in H:\Apache24\htdocs\test4\5\example5-8.php on line 2

Fatal error: require_once(): Failed opening required 'library.php' (include_path='.;C:\php\pear') in H:\Apache24\htdocs\test4\5\example5-8.php on line 2