perl Schedule::Cron 模块

程序代码这样，复制网上文章的、
Perl code

#!/usr/bin/perl -w 
use strict;
 use Schedule::Cron;
 my $dispatcher = sub { print "Time to start...\n"};
 my $cron = new Schedule::Cron($dispatcher);
  my $min = $ARGV[0];
  my $hour = $ARGV[1];
  my $day_of_month = $ARGV[2];
  my $month = $ARGV[3];
  my $day_of_week = $ARGV[4];
  my $seconds = $ARGV[5];
  $cron->add_entry("$min $hour $day_of_month $month $day_of_week $seconds");
  $cron->run;

但是运行时出现这样的错误：
[root@localhost perl]# ./perl03.pl 1 1 1 1 1 1
Undefined subroutine &Schedule::Cron::parsedate called at /usr/lib/perl5/site_perl/5.8.8/Schedule/Cron.pm line 1512.

不知道是什么原因 。

提示库中缺少子程序，库没安装完全？