my linux kernel is 2.2.20
i am trying to edit/list crontab [i also tried crontab -e -u root]
but i am getting this err msg:
You (root) are not allowed to use this program (crontab)
See crontab(1) for more information

i checked /etc/cron.allow root and my other users are listed [fyi i am able to edit/list crontab with my other users]
there is no cron.deny file

i checked /var/spool/cron and root is listed there. i can do a more root to see my crontab entries.
i checked the crontab file under /usr/bin , nobody has tampered with the permissions or setuid bit.

what else can cause this err msg to come ?

can anybody help me please