samba - Jun 2003 - Question on configuring samba 2.2.8 as PDC under OS X 10.2.4

I tried to configure samba 2.2.8 as PDC under OS X 10.2.4.
I followed http://www.afp548.com/Articles/Jaguar/sambapdc.html.
However, I saw the error pop windows at xp : Access denied. I checked server 
site. There were some errors very strange:

[2003/05/28 22:13:33, 1] 
/SourceCache/samba/samba-23/source/smbd/password.c:DirServicesAuthUser(1834)
User "admin" authenticated successfully with 
"dsAuthMethodStandard:dsAuthSMBNTKey" :)
[2003/05/28 22:13:33, 0] 
/SourceCache/samba/samba-23/source/passdb/pdb_smbpasswd.c:pdb_getsampwnam(1367
)
unable to open passdb database.
[2003/05/28 22:13:33, 0] 
/SourceCache/samba/samba-23/source/passdb/pdb_smbpasswd.c:pdb_getsampwnam(1367
)
unable to open passdb database.
[2003/05/28 22:13:33, 0] 
/SourceCache/samba/samba-23/source/passdb/pdb_smbpasswd.c:add_smbfilepwd_entry
(573)
add_smbfilepwd_entry: unable to open file.
[2003/05/28 22:13:33, 0] 
/SourceCache/samba/samba-23/source/rpc_server/srv_samr_nt.c:_api_samr_create_u
ser(1929)
Failed to add entry for user fchen$.

What happened here? The passdb supposed to use ldap, but it did not.

Thank you for your help.