Mistake "NXDOMAIN» (Name error, DNS_PROBE_FINISHED_NXDOMAIN, RFC 2308) means that in the system DNS domain information missing.
This error may indicate that the domain itself or the domain to which it is directed does not exist. CNAME... For example, if the registered domain
domain.com has a CNAME record pointing to an unregistered
domain.shop, then when going to
domain.com this error will be displayed.
It is important to consider that such an error may occur for some time for only a registered or renewed domain, while information about it not updated in system DNS.
If the domain is registered and works correctly, then you can try to eliminate this error using the methods described in here.