AutoSSL Issue Failed!

Hello,

I have just installed CWP on centos.

When i add new domain, i got the error below.

AutoSSL Issue Failed![Tue Apr 17 15:53:41 EDT 2018] Single domain='thedomain.top'
[Tue Apr 17 15:53:41 EDT 2018] Getting domain auth token for each domain
[Tue Apr 17 15:53:41 EDT 2018] Getting webroot for domain='thedomain.top'
[Tue Apr 17 15:53:41 EDT 2018] Getting new-authz for domain='thedomain.top'
[Tue Apr 17 15:53:43 EDT 2018] The new-authz request is ok.
[Tue Apr 17 15:53:44 EDT 2018] Verifying:thedomain.top
[Tue Apr 17 15:53:47 EDT 2018] thedomain.top:Verify error:DNS problem: SERVFAIL looking up A for thedomain.top
[Tue Apr 17 15:53:47 EDT 2018] Please check log file for more details: /root/.acme.sh/acme.sh.log

are you sure that your dns records are correctly set on your server to use your nameservers?