Thank you for getting in contact with us via this ticket!
That message is stemming from a cron job you have running on your server. It is reporting the cron script being used is throwing the error:
sudo: unable to resolve host natdanai
You may need to unsure your hostname is a Fully Qualified Domain Name (FQDN). You can change your hostname using the command:
hostname new_hostname
Replacing new_hostname with the FQDN.
Please let us know if you have any further questions, or if we can provide you with any other assistance.