crontab permissions are wrong. please set to 4755
From WebHostingNeeds.com
When setting cron job on cpanel server, get following error
/usr/bin/crontab permissions are wrong. Please set to 4755
This happens on CentOS 5 and RHEL 5 servers. I never found such error in CentOS 4 servers.
To fix the problem, run
yum -y install vixie-cron crontabs chmod 4755 /usr/bin/crontab