Samba configuration problem

[a.morrocchesi]

Hi Samba list,
I have a problem with Samba configuration.
I have a PDC Windows NT4 with SP6a and a PC with Samba 2.2.1a.
I want to do Samba Sever a NT domain server member.
I have configured Samba Server as follow:
workgroup = felix
security = domain
password server = superserver
encrypt password = yes
smb passwd file = /etc/samba/smbpasswd
local master = no
os level = 2
preferred master = no
I write smbclient -L superserver, I see share resources in superserver NT PDC domain,
If I write on Samba server:
smbstatus
I read:

Samba version 2.2.1a
Service      uid       guid       pid       machine
---------------------------------------------------------------------
Failed to open byte range locking database 
ERROR: Failed to initialize loking database 
Can't initialise locking module-exiting

Why this error? 
Regards 

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