Warning: require_once(Zend/Captcha/Adapter.php): failed to open stream: No such file or directory in C:\Apache24\htdocs\library\Zend\Captcha\Base.php on line 23

Fatal error: require_once(): Failed opening required 'Zend/Captcha/Adapter.php' (include_path='.;C:\php\pear') in C:\Apache24\htdocs\library\Zend\Captcha\Base.php on line 23