Cant create new Domain

[kingkong]

Hello mod's
username : bigsmo
my email : anti2kingkong[at]gmail.com
Hostname: box11.host1free.com


i have site with domain bigsmoke.tk, first of all i try to move my dns record to bigsmoke.net, but when i try to delete the bigsmoke.tk NS record to replace with bigsmoke.net, its goes error like this one

Error Deleting Records

Details

Unable to save dns zone: named-zonecheck returned:
loading "bigsmoke.tk" from "/var/named/bigsmoke.tk.db.temp" class "IN"
/var/named/bigsmoke.tk.db.temp:17: ignoring out-of-zone data (bigsmoke.net)
zone bigsmoke.tk/IN: has no NS records

because my first move doesnt work then i try to create new domain with bigsmoke.net
but the system said

Cannot create that domain


Details

That domain already exists

what happen ? could you explain this situation

[Modestas]

Hello,

Probably you need to change bigsmoke.net name servers to ns1.host1free.com and ns2.host1free.com.