How to configure a DNS server by YAST2

I run these commands to install DNS server dependencies on openSUSE Tumbleweed:

sudo zypper in -t pattern dhcp_dns_server
sudo systemctl enable named.service
sudo systemctl start named.service

To configure the DNS server, I'm trying YAST2 following [this documentation](https://doc.opensuse.org/documentation/leap/reference/html/book-opensuse-reference/cha-dns.html) :

sudo yast2 dns-server

I intend to configure example.com domain zone with IP address 1.2.3.4. ### What I did I have a DNS zone of *master* type: My *NS Records* tab is: My *Records* tab is: ### Problem However, saving the configuration runs into a problem: I couldn't figure it out. Can anyone help?