Domain bind to VPS


I am a newbie in Virtualmin and VPS. I’ve managed to install and config mysql, postgres, tomcat etc. and now I’m stuck in domain binding to VPS.
I’ve setup in registrar 2 nameservers to my VPS ip and ,
I can’t configure Virtualmin to get the domain. In Webmin - Bind, I don’t have any error, but in Virtualmin I have NS record cannot be resolved to an IP address

$ttl 38400 @ IN SOA ( 1497415171 10800 3600 604800 38400 ) IN A IN A IN A IN A IN A IN MX 5 IN TXT "v=spf1 a mx ip4: ?all" IN NS IN NS IN A IN A

Help, Thank you