[SOLVED] name servers are not registered on Godaddy

[903]

My domain is registered on Godaddy.
When I want to set the name servers with "ns1.p2h.niftyhost.us" on it,it said this server is not registered.
I remember someone had report this problem before on this forum , and he said it can set the IP instead of the url.But when I try ,it said "wrong LTD" ,I don't know why, but it seems can't set direct IP .
Is there any other people also use Godaddy ? And how to set the name servers on it?

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When I use this free webhost this month before the server carsh down,I use "ns1.niftyhost.us" instead of "ns1.free.niftyhost.us" for name servers ,it works OK.
But it can't work right now.