session-installer crashed with TypeError in _render_warning(): could not convert argument to correct param type

[bonimba]

Binary package hint: sessioninstaller

Description: Ubuntu Natty (development branch)
Release: 11.04
sessioninstaller:
  Installato: 0.20+bzr117-0ubuntu1
  Candidato: 0.20+bzr117-0ubuntu1
  Tabella versione:
 *** 0.20+bzr117-0ubuntu1 0
        500 http://archive.ubuntu.com/ubuntu/ natty/main amd64 Packages
        100 /var/lib/dpkg/status

-----------------------------------------------
I was extracting a file. rar with the option "Extract here": having not yet installed the package "unrar" the window appeared to install it. At that point, three consecutive errors are displayed (presumably getting the same error).
However I managed to install unrar and extract the file.

ProblemType: Crash
DistroRelease: Ubuntu 11.04
Package: sessioninstaller 0.20+bzr117-0ubuntu1
ProcVersionSignature: Ubuntu 2.6.38-5.32-generic 2.6.38-rc6
Uname: Linux 2.6.38-5-generic x86_64
NonfreeKernelModules: nvidia
Architecture: amd64
Date: Thu Mar 3 08:50:57 2011
ExecutablePath: /usr/bin/session-installer
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Alpha amd64 (20110202)
InterpreterPath: /usr/bin/python2.7
PackageArchitecture: all
ProcCmdline: /usr/bin/python /usr/bin/session-installer
ProcEnviron:
 SHELL=/bin/bash
 LANGUAGE=it_IT:it:en_GB:en
 LANG=it_IT.UTF-8
PythonArgs: ['/usr/bin/session-installer']
SourcePackage: sessioninstaller
Title: session-installer crashed with TypeError in _render_warning(): could not convert argument to correct param type
Traceback:
 Traceback (most recent call last):
   File "/usr/lib/pymodules/python2.7/sessioninstaller/core.py", line 392, in _render_warning
     renderer.props.stock_id = 0
 TypeError: could not convert argument to correct param type
UpgradeStatus: No upgrade log present (probably fresh install)
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 #713984, 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.