I have configured the smb to share a printer. When I try to query
my shared resources using smbclient in my localhost

smbclient -L localhost
added interface 123.223.160.23 bcast:123.223.160.50 nmask:255.255.255.0
password:

It asked for password, so I enterred my root password.
Then this error appeared.


sesssion status failed: NT_STATUS_LOGON_FAILURE


I checked my /var/log/samba/<hostname>.log

This was the entry
passdb/pdb_smb passwd.cdb_getsampwnam(1369)
unable to open passdb database


It seems there is an error in password handling.

Wht should I do?

Have you added root as a samba user as well as a unix user? Try using:
smbadduser root:root