You (oracle) are not allowed to use this program (crontab)

Problem:

$ crontab -e
You (oracle) are not allowed to use this program (crontab)
See crontab(1) for more information

Solution:

cd /usr/lib/cron or /etc directory
## or find where cron.allow and cron.deny are:
## find / -name "cron.allow"
## find / -name "cron.deny"

Either remove your user in

cron.deny

and add your username in

cron.allow

If files do not exist, we can create them.