system-config-samba.py crashed with SystemError in __init__()

Binary package hint: system-config-samba

I'm using Ubuntu in our company.
My Ubuntu version is V8.04, which is upgraded from V7.10.
Most of the computers in our company are using WindowsXP, and we have our network domain.
I found that my Ubuntu can not share folders to others properly, neither accessing other computer's sharing-folder.
So I modified some configuration settings in /etc/samba/smb.conf, but it does not work!
So I installed Samba and folder-share through Application-->Add/Remove.
After Samba installed, I tried to launch it from System --> Administration --> Samba, then fatal error occured.

ProblemType: Crash
Architecture: i386
Date: Wed Apr 30 15:54:00 2008
DistroRelease: Ubuntu 8.04
ExecutablePath: /usr/share/system-config-samba/system-config-samba.py
InterpreterPath: /usr/bin/python2.5
NonfreeKernelModules: nvidia
Package: system-config-samba 1.2.50-0ubuntu2
PackageArchitecture: all
ProcCmdline: /usr/bin/python /usr/sbin/system-config-samba
ProcEnviron:
 PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/X11R6/bin
 LANG=en_US.UTF-8
 SHELL=/bin/bash
PythonArgs: ['/usr/sbin/system-config-samba']
SourcePackage: system-config-samba
Title: system-config-samba.py crashed with SystemError in __init__()
Uname: Linux 2.6.24-16-generic i686
UserGroups: