DiskSpaceScreenlet.py crashed with TypeError in recalculate_size(): integer argument expected, got float

Error appeared when configuring the applet : couldn't close paths configuration window

ProblemType: Crash
DistroRelease: Ubuntu 11.04
Package: screenlets-pack-all 0.0.1~bzr838+repack-0ubuntu1
ProcVersionSignature: Ubuntu 2.6.38-7.39-generic-pae 2.6.38
Uname: Linux 2.6.38.2-1 i686
NonfreeKernelModules: fglrx
Architecture: i386
Date: Sat Apr 9 17:58:39 2011
ExecutablePath: /usr/share/screenlets/screenlets-pack-all/DiskSpace/DiskSpaceScreenlet.py
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Beta i386 (20110330)
InterpreterPath: /usr/bin/python2.7
PackageArchitecture: all
ProcCmdline: python -u /usr/share/screenlets/screenlets-pack-all/DiskSpace/DiskSpaceScreenlet.py
ProcEnviron:
 LANGUAGE=fr_FR:C:en
 LANG=fr_FR.UTF-8
 SHELL=/bin/bash
PythonArgs: ['/usr/share/screenlets/screenlets-pack-all/DiskSpace/DiskSpaceScreenlet.py']
SourcePackage: indiv-screenlets
Title: DiskSpaceScreenlet.py crashed with TypeError in recalculate_size(): integer argument expected, got float
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare