DNS error: Server returned error NXDOMAIN, mitigating potential DNS violation DVE-2018-0001, retrying transaction with reduced feature level UDP

I saw a lot of errors like below in my /var/log/syslog:

Jun 10 11:06:39 zabbix systemd-resolved[30232]: Server returned error NXDOMAIN, mitigating potential DNS violation DVE-2018-0001, retrying transaction with reduced feature level UDP.
Jun 10 11:06:48 zabbix systemd-resolved[30232]: Server returned error NXDOMAIN, mitigating potential DNS violation DVE-2018-0001, retrying transaction with reduced feature level UDP.
Jun 10 11:06:51 zabbix systemd-resolved[30232]: Server returned error NXDOMAIN, mitigating potential DNS violation DVE-2018-0001, retrying transaction with reduced feature level UDP.
Jun 10 11:06:51 zabbix systemd-resolved[30232]: message repeated 4 times: [ Server returned error NXDOMAIN, mitigating potential DNS violation DVE-2018-0001, retrying transaction with reduced feature level UDP.]
Jun 10 11:07:02 zabbix systemd-resolved[30232]: Server returned error NXDOMAIN, mitigating potential DNS violation DVE-2018-0001, retrying transaction with reduced feature level UDP.

I checked my /etc/resolv.conf and it symlinked to a file which was not exist.

ls -l /etc/resolv.conf
lrwxrwxrwx 1 root root 39 Apr 27  2018 /etc/resolv.conf -> ../run/systemd/resolve/stub-resolv.conf

So I removed it and symlinked it to /run/systemd/resolve/resolv.conf which is systemd's resolv.conf file because I am using systemd's resolver.

So,

ln -s /run/systemd/resolve/resolv.conf /etc/resolv.conf

Then restart the relevant service: systemctl restart systemd-resolved

I checked again and the errors was gone.

That's all there is to it.