DNS Errors

I am recieving the following errors and i was wondering if anyone new how to resolve them?
Registration of the DNS record ‘gc._msdcs.firebug.lifesafety.com.au. 600 IN A 192.168.0.5’ failed with the following error:
DNS server not authoritative for zone.

and it also fails to deregister the records with the same errors.

Please help
thanks
Eli