The DNS server is not root authoritative and no root hints were specified in the cache.dns file. Where the server is not ...

The DNS server is not root authoritative and no root hints were specified in the cache.dns file. 
Where the server is not a root server, this file must specify root hints in the form of at least one name server (NS) resource record, indicating a root DNS server and a corresponding host (A) resource record for that root DNS server.  Otherwise, the DNS server will be unable to contact the root DNS server on startup and will be unable to answer queries for names outside of its own authoritative zones.  To correct this problem, use the DNS console to update the server root hints.  For more information, see the online Help.