obmenu crashed with IOError in saveMenu()

[Mars]

Binary package hint: obmenu

Exit from openbox session, then i logged into a gnome session, and a popup with "obmenu crashed" appeared.
So i reported here.

ProblemType: Crash
Architecture: amd64
Date: Thu Mar 25 12:01:59 2010
DistroRelease: Ubuntu 10.04
ExecutablePath: /usr/bin/obmenu
InstallationMedia: Ubuntu 10.04 "Lucid Lynx" - Alpha amd64 (20100312)
InterpreterPath: /usr/bin/python2.6
NonfreeKernelModules: nvidia
Package: obmenu 1.0-1ubuntu1
ProcCmdline: /usr/bin/python /usr/bin/obmenu
ProcEnviron:
 LANG=it_IT.utf8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.32-17.26-generic 2.6.32.10+drm33.1
PythonArgs: ['/usr/bin/obmenu']
SourcePackage: obmenu
Title: obmenu crashed with IOError in saveMenu()
Uname: Linux 2.6.32-17-generic x86_64
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare