samba - Jul 2004 - Why this error? Unable to find Domain Master Browser

Hi. 

Can someone tell me why I'm getting this error (see below) in my daemon
error log every hour? In my smb.conf section, I have my Linux box set to:

wins support = yes
os level = 65

This message occurs even when all Windows workstations are shut off, so it must
be something with my samba configuration on the Linux box.

Help appreciated. 
Regards, 
Andy Liebman


Jul 21 06:54:34 localhost nmbd[1937]: [2004/07/21 06:54:34, 0]
nmbd/nmbd_browsesync.c:find_domain_master_name_query_fail(350)
Jul 21 06:54:34 localhost nmbd[1937]:   find_domain_master_name_query_fail: 
Jul 21 06:54:34 localhost nmbd[1937]:   Unable to find the Domain Master Browser
name SALES_GROUP<1b> for the workgroup SALES_GROUP.
Jul 21 06:54:34 localhost nmbd[1937]:   Unable to sync browse lists in this
workgroup.
Jul 21 06:54:34 localhost nmbd[1937]: [2004/07/21 06:54:34, 0]
nmbd/nmbd_browsesync.c:find_domain_master_name_query_fail(350)
Jul 21 06:54:34 localhost nmbd[1937]:   find_domain_master_name_query_fail: 
Jul 21 06:54:34 localhost nmbd[1937]:   Unable to find the Domain Master Browser
name SALES_GROUP<1b> for the workgroup SALES_GROUP.
Jul 21 06:54:34 localhost nmbd[1937]:   Unable to sync browse lists in this
workgroup.