Delegation not found at parent

[Patrik Laszlo]

Ciao!

How are you?

I have my ns1.namesystem.tk

It works, but when I test it 
(http://dnscheck.pingdom.com/?domain=ns1.namesystem.tk)

I get this error:

What is this and how can I resolve. it?

Delegation not found at parent.

No delegation could be found at the parent, making your zone unreachable 
from the Internet.

Not enough nameserver information was found to test the zone 
ns1.namesystem.tk, but an IP address lookup succeeded in spite of that.

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