It seems that an existing cron file in /var/spool/cron/ has a wrong format or content or cannot be read or written for insufficient permissions. You will need to investigate the permissions of /var/spool/cron/ and its contents and possibly the format of the files in that path to find the reason why a file cannot be parsed.
Peter thank you for your reply, the permissions are all right, I have renamed the file root in /var/spool/cron/ and created a new root file this solved the error for me
Peter thank you for your reply, the permissions are all right, I have renamed the file root in /var/spool/cron/ and created a new root file this solved the error for me