Warning: require(Net/SMTP.php): Failed to open stream: No such file or directory in /home/lab/brc/WWW/Ch27/Net_SMTP-1.4.2/examples/basic.php on line 3

Fatal error: Uncaught Error: Failed opening required 'Net/SMTP.php' (include_path='.:/usr/local/share/pear') in /home/lab/brc/WWW/Ch27/Net_SMTP-1.4.2/examples/basic.php:3 Stack trace: #0 {main} thrown in /home/lab/brc/WWW/Ch27/Net_SMTP-1.4.2/examples/basic.php on line 3