From the AIX Message Guide and Reference:
0481-124 Cannot create the cron file in the /usr/spool/cron/crontabs directory
Possible Causes
You entered the crontab command and the crontabs directory does not exist.
The file system containing the directory is full.
Procedures for Recovery
Ensure that the crontabs directory exists.
Use the ls -l command to check the crontabs directory. This directory should display with permissions set to drwxrwx--- , ownership set to bin , and group set to cron .
If the crontabs directory does not exist, create it and give it the proper permission, ownership, and group by doing the following: >
Enter the su command to change to the root user.
Use the cd command to change to the proper directory.
Enter the mkdir crontabs command to create the directory.
Enter the chown bin.cron crontabs command to give the proper ownership to the directory.
Enter the chmod 770 crontabs command to give the proper permissions on the directory.
Verify that there is space left on the file system and the status is correct.
Enter the df command on the command line to list the available space in the /var file system.
If there is no available space on the file system containing the crontabs directory, remove any unnecessary files.