ERROR: nmbd is already running

[iordache]

I have the following situation, in log.nmb:
"[1999/03/23 07:46:08, 1] nmbd/nmbd.c:main(672)
  Netbios nameserver version 2.0.3 started.
  Copyright Andrew Tridgell 1994-1998
[1999/03/23 07:46:08, 0] lib/pidfile.c:pidfile_create(86)
  ERROR: nmbd is already running. File
/usr/local/samba/var/locks/nmbd.pid exists and process id 464 is
running."
This message is repeating for one minute _every second_, and again 10-15
minutes later, _all day_ wich cause a pretty big log file. 
Is this a normal situation ?