[Samba] smbpasswd !!?!

[Alexander Varga]

please help me. 
Why I cannot create a user with smbpasswd without having this username in /etc/passwd???
###################
bash-2.05# smbpasswd -a testaccount
New SMB password:
Retype new SMB password:

Failed to initialise SAM_ACCOUNT for user testaccount.
Failed to modify password entry for user testaccount
bash-2.05#
##############
my global in smb.conf
[global]
   workgroup = J9_C
   server string = %h server (Samba %v)
   dns proxy = no
   log file = /usr/local/samba/var/log.%m
   passdb backend = tdbsam smbpasswd
   invalid users = root
   passwd program = /bin/passwd %u
   socket options = TCP_NODELAY

I compilled my samba using 
./configure --prefix=/usr/local/samba  --with-pam --with-pam_smbpass --with-acl-support
and made a solaris package.