This message comes from the NFS status monitor daemon statd(1M), which provides crash recovery services for the NFS lock daemon lockd(1M). The message indicates that statd(1M) has left old references in the /var/statmon/sm and /var/statmon/sm.bak directories. After a user has removed or modified a host in the hosts database, statd(1M) might not properly purge files in these directories, which results in its trying to communicate with a nonexistent host.
Remove the file named variable (where variable is the host name) from both the /var/statmon/sm and /var/statmon/sm.bak directories. Then kill the statd(1M) daemon and restart it. If that does not get rid of the message, kill and restart lockd(1M) as well. If that remedy does not work, reboot the machine at your convenience.