ClearCalendarScreenlet.py crashed with AttributeError in sys_get_window_manager()

[hhlp]

Binary package hint: screenlets

ubuntu 10.10 maverick
64 bits

screenlets:
  Instalados: 0.1.2-7ubuntu2
  Candidato: 0.1.2-7ubuntu2
  Tabla de versión:
 *** 0.1.2-7ubuntu2 0
        500 http://archive.ubuntu.com/ubuntu/ maverick/universe amd64 Packages
        100 /var/lib/dpkg/status

crash after upgrade from lucid to maverick

ProblemType: Crash
DistroRelease: Ubuntu 10.10
Package: screenlets 0.1.2-7ubuntu2
ProcVersionSignature: Ubuntu 2.6.35-22.33-generic 2.6.35.4
Uname: Linux 2.6.35-22-generic x86_64
NonfreeKernelModules: nvidia
Architecture: amd64
Date: Wed Sep 22 12:49:11 2010
EcryptfsInUse: Yes
ExecutablePath: /usr/share/screenlets/ClearCalendar/ClearCalendarScreenlet.py
InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release amd64 (20091027)
InterpreterPath: /usr/bin/python2.6
PackageArchitecture: all
ProcCmdline: python -u /usr/share/screenlets/ClearCalendar/ClearCalendarScreenlet.py
ProcEnviron:
 LANG=es_ES.utf8
 SHELL=/bin/bash
PythonArgs: ['/usr/share/screenlets/ClearCalendar/ClearCalendarScreenlet.py']
SourcePackage: screenlets
Title: ClearCalendarScreenlet.py crashed with AttributeError in sys_get_window_manager()
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare

[Apport retracing service (apport)]

Thank you for taking the time to report this crash and helping to make Ubuntu better. This particular crash has already been reported and is a duplicate of bug #636374, so is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Please continue to report any other bugs you may find.