error setting domain dns

[dappledore]

when saving domain dns i get this error, even if i set to default as well.

   "The data provided cannot be used, please correct it and resubmit your request."

I am settings to aws DNS servers.

Looking at the http response in console it gives 

Status Code:

422 Unprocessable Entity

Which means request is well formed but there is semantic problem.

I noticed in the request ipaddresses is blank ? 

[{hostname: "ns-265.awsdns-33.com", ipAddresses: []}, {hostname: "ns-1548.awsdns-01.co.uk", ipAddresses: []}]

Example of dns i am trying

ns-265.awsdns-33.com

ns-1548.awsdns-01.co.uk

But default shouldnt give error , right?