samba applet crashes on start

it crashes immediately without any message when I select System->Administration->Samba

ProblemType: Crash
Architecture: i386
Date: Sun May 11 19:33:42 2008
DistroRelease: Ubuntu 8.04
ExecutablePath: /usr/share/system-config-samba/system-config-samba.py
InterpreterPath: /usr/bin/python2.5
NonfreeKernelModules: fglrx
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: