samba - Apr 2007 - Some errors importing accounts from NT4 PDC with net vampire

Hi
I have folowed this guide
http://www.enterprisenetworkingplanet.com/netos/article.php/3457461 to
import users from my NT4 domain to a debian sarge with samba 3.0.14a
Everything runs fine till the net rpc vampire command, some users give
an error others are imported fine.
I don't see any problem on this users configuration in the NT4 server,
here is part of the output:
thanks.

fb_nt2:/etc/samba# net rpc vampire -S fb_nt -W FFTBL -UFilipe%*****
Fetching DOMAIN database
Creating account: Administrator
Creating account: Guest
[2007/03/19 11:19:24, 0] passdb/pdb_tdb.c:tdb_update_sam(641)
Unable to modify passwd TDB! Error: Record does not exist occured while
storing the main record (USER_guest)
Creating account: FB_NT$
[2007/03/19 11:19:24, 0] passdb/pdb_tdb.c:tdb_update_sam(641)
Unable to modify passwd TDB! Error: Record does not exist occured while
storing the main record (USER_fb_nt$)
Creating account: Augusto
[2007/03/19 11:19:24, 0] passdb/pdb_tdb.c:tdb_update_sam(641)
Unable to modify passwd TDB! Error: Record does not exist occured while
storing the main record (USER_augusto)
Creating account: Miit
[2007/03/19 11:19:24, 0] passdb/pdb_tdb.c:tdb_update_sam(641)
Unable to modify passwd TDB! Error: Record does not exist occured while
storing the main record (USER_miit)
Creating account: Natalia
[2007/03/19 11:19:24, 0] passdb/pdb_tdb.c:tdb_update_sam(641)
Unable to modify passwd TDB! Error: Record does not exist occured while
storing the main record (USER_natalia)
Creating account: Publico
Creating account: Mariana
Creating account: Jaime
[2007/03/19 11:19:24, 0] passdb/pdb_tdb.c:tdb_update_sam(641)
Unable to modify passwd TDB! Error: Record does not exist occured while
storing the main record (USER_jaime)
Creating account: Filomena
[2007/03/19 11:19:24, 0] passdb/pdb_tdb.c:tdb_update_sam(641)
Unable to modify passwd TDB! Error: Record does not exist occured while
storing the main record (USER_filomena)
Creating account: Mendes
[2007/03/19 11:19:24, 0] passdb/pdb_tdb.c:tdb_update_sam(641)
Unable to modify passwd TDB! Error: Record does not exist occured while
storing the main record (USER_mendes)
Creating account: Maria do Ceu
[2007/03/19 11:19:24, 0] passdb/pdb_tdb.c:tdb_update_sam(641)
Unable to modify passwd TDB! Error: Record does not exist occured while
storing the main record (USER_maria do ceu)
Creating account: M1
Creating account: isabel
Creating account: Luis
Creating account: Carla
Creating account: M2
Creating account: Manuela
Creating account: Jose Alberto
Creating account: Labqui
Creating account: Faria