cron and missing file

Hi, And TIA Am running 7.1 on a laptop. After the machine has been more than a certain time without a reboot (aprox 19-20 days I think) I start getting the following warning mailed to me daily. I usually delete the message and all seems fine. Which (if any) parameter can I reset to prevent this from happenning? find: /var/spool/cron/lastrun/cron.daily: No such file or directory Cheers Francesco