Warning: require_once(Net/Socket.php) [function.require-once]: failed to open stream: No such file or directory in /www/production/eventum/lib/pear/Net/SMTP.php on line 24

Fatal error: require_once() [function.require]: Failed opening required 'Net/Socket.php' (include_path='.:/usr/php-5.2.5/lib/php') in /www/production/eventum/lib/pear/Net/SMTP.php on line 24