sugar-session crashed with ImportError in <module>()

[Kiwinote]

Binary package hint: sugar

after installing sugar & sugar-activities and launching sugar the following issue occured.

ProblemType: Crash
Architecture: amd64
DistroRelease: Ubuntu 9.04
ExecutablePath: /usr/bin/sugar-session
InterpreterPath: /usr/bin/python2.5
NonfreeKernelModules: nvidia
Package: sugar 0.83.5-0ubuntu2
PackageArchitecture: all
ProcCmdline: python /usr/bin/sugar-session
ProcEnviron:
 LANG=en_US.UTF-8
 SHELL=/bin/bash
PythonArgs: ['/usr/bin/sugar-session']
SourcePackage: sugar
Title: sugar-session crashed with ImportError in <module>()
Traceback:
 Traceback (most recent call last):
   File "/usr/bin/sugar-session", line 41, in <module>
     from jarabe.desktop.homewindow import HomeWindow
 ImportError: No module named jarabe.desktop.homewindow
Uname: Linux 2.6.28-8-generic x86_64
UserGroups: adm admin cdrom dialout fuse lpadmin plugdev sambashare