Nameserver glue records are incorrect. The ns1.box.betterphoneme.com and ns2.box.betterphoneme.com nameservers must be configured at your domain name registrar as having the IP address 184.108.40.206. They currently report addresses of [Not Set]/[Not Set]. It may take several hours for public DNS to update after a change.
Getting this error,
I created the nameservers from Domain provider. Also I can send and receive mails but getting this error.