Warning: require(Net/SMTP.php): failed to open stream: No such file or directory in D:\RESPALDO\WebBppc\Descargas\Sistemas\PHP\PEAR\docs\Net_SMTP\examples\basic.php on line 3

Fatal error: require(): Failed opening required 'Net/SMTP.php' (include_path='.;C:\php\pear') in D:\RESPALDO\WebBppc\Descargas\Sistemas\PHP\PEAR\docs\Net_SMTP\examples\basic.php on line 3