The DNS server encountered error 9002

I have installed Aditional domain controller and configured dns.Noe the dns server is adtional domain controller generates DNS realated the Warning event id messgare event id:4521 source:DNS Description “The DNS server encountered error 9002
attempting to load zone . from Active Directory. The DNS server will
attempt
to load this zone again on the next timeout cycle”

And i could see my root intigrated DNS appending host name as hostname follwed by IP address.For eg Pc1.192,168.1.1.What could be the problem? can some body help me?