My unqualified host name (alex-NUC8i7HNK) unknown; sleeping for retry

I am using KDE Plasma 5.18.5 on Intel-NUC.
My log file shows the above error. After reading several Google search answers, I tried several of them, but no resolution.

My /etc/hosts file has in it the following:

Code:127.0.0.1 localhost
127.0.1.1 alex-NUC8i7HNK

# The following lines are desirable for IPv6 capable hosts
::1 ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allroutersIt seems that my cron / anacron backup job fails because of this.

Any ideas?

Thanks
Alex