Error create Slave DNS Server

Hello, i migrate my old Centos 5 to a new Centos 7

This is my new server: Operating system CentOS Linux 7.2.1511 Webmin version 1.821 Virtualmin version 5.04 Kernel and CPU Linux 3.10.0-327.36.3.el7.x86_64 on x86_6

I am making a DNS slave server and when i go to a Bind DNS servers -> Cluster Slaver Servers an add server -> 192.168.x.x and Top level/Create secondary on slave->Yes/Create all existing masters->Yes/Name->same as hostname

I have this error ->

Failed to add server : Could not work out this system's IP address. You should set the Default master server IP for remote slave zones on the Module Config page.

I add webmin server in webmin servers index but i not understand this error, can help me ???

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Howdy -- what is your server's hostname?

You can determine that by running the "hostname" command".

hostname -> hosting."xxx".org

But when i make the first install the hostname are centos7.xxx.local and after transfer all domains i change the hostname to hosting.xxx.org and now a lot of domains have a ns server -> centos7.xxx.local
How can i change all domains to correct hostname ???

My migration has been roughly, install a new centos 7, update it, install virtualmin pro and from the old server go transferring domain by domain

Hello, can anybody help me to change the hostname in all domains ???

If you have an existing domain in Virtualmin with incorrect DNS records, those would need to be manually updated.

However, if it's an option to re-perform the restore of any of those Virtual Servers, I believe the NS record would be fixed during the restore process (you might want to test one or two first just to be certain of that).