[Samba] passdb not found

[maraqas]

Hello,
    i've got a Redhat 8.0 installation. I tried to configure my linux box to
run the
samba server and share some dirs and a printer. When i try to connect from a
Windows machine, the request fails and the log says: unable to open passdb
database. The same result i get if trying to run smbpasswd <user_name> from
the linux box itself.
What can i do? Do you need any additional info?

maq