dns error

[Rick Francis]

May 10 14:32:27 my_dns_server named[2998]: Ready to answer queries.
May 10 14:32:39 my_dns_server named[2998]: No root nameservers for class IN

above is from syslog.log.

in my internal my_dns_server i have a forwarders directive pointing to a
root server on the internet.

when i type nslookup www.yahoo.com; it fails, and i get 'no root nameservers
for class IN'

insights are very welcome. rf.