computer-janitor-gtk crashed with AttributeError in reorder(): 'ListStore' object has no attribute 'reorder'

Hi, I was not doing something special. I wanted to reorder the list by size from the menu.

TEST CASE:
1- Open computer janitor
2- from the View Menu, choose "sort by size"

Result:
Traceback (most recent call last):
  File "/usr/share/computerjanitor/computerjanitorapp/gtk/ui.py", line 475, in on_sort_by_name_toggled
    self.sort_cruft()
  File "/usr/share/computerjanitor/computerjanitorapp/gtk/ui.py", line 224, in sort_cruft
    self.store.reorder(cruft_indexes)
  File "/usr/share/computerjanitor/computerjanitorapp/gtk/store.py", line 129, in reorder
    return self.store.reorder(*args, **kws)
AttributeError: 'ListStore' object has no attribute 'reorder'

thanks

ProblemType: Crash
DistroRelease: Ubuntu 11.10
Package: computer-janitor-gtk 2.1.0-0ubuntu5 [modified: usr/share/doc/computer-janitor-gtk/changelog.Debian.gz]
ProcVersionSignature: Ubuntu 3.0-2.3-generic 3.0.0-rc4
Uname: Linux 3.0-2-generic i686
Architecture: i386
Date: Wed Jul 6 19:08:29 2011
ExecutablePath: /usr/share/computerjanitor/computer-janitor-gtk
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release i386 (20110427.1)
InterpreterPath: /usr/bin/python2.7
PackageArchitecture: all
ProcCmdline: /usr/bin/python /usr/share/computerjanitor/computer-janitor-gtk
ProcEnviron:
 LANG=en_US.UTF-8
 SHELL=/bin/bash
PythonArgs: ['/usr/share/computerjanitor/computer-janitor-gtk']
SourcePackage: computer-janitor
Title: computer-janitor-gtk crashed with AttributeError in reorder(): 'ListStore' object has no attribute 'reorder'
UpgradeStatus: Upgraded to oneiric on 2011-07-01 (5 days ago)
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