Originally Posted by xuebof
Question was after typing crontab -u user -e or crontab -e command system gave back some error code to user, he futher told me that crond and and other utilities are installed. How to fix this problem?
"Some error code" is too vague.
Anyway, read the manpages for crontab(1). There is information on allowing / denying users that may help answer the question.