py error when launching snapshot

Hi
Your software seems very promising, but...
I try to run backintime from source on a gentoo, but it gets stuck on some bizarre python error, when I press the backup now button (and when doing $backintime --backup)

Next to this little log I can sent you my package versions or whatever else that might help. Would be fun to get this going, but got no idea where to start looking.

$backintime-gnome
Back In Time
Version: 0.9.26

Back In Time comes with ABSOLUTELY NO WARRANTY.
This is free software, and you are welcome to redistribute it
under certain conditions; type `backintime-gnome --license' for details.

Snapshots path: /home/xxxxx/Video/backintime
Automatic backup: Disabled
crontabs/stijn: Permission denied
crontab: error renaming crontabs/tmp.XXXXs983dG to crontabs/stijn
rename: Operation not permitted
Back In Time
Version: 0.9.26

Back In Time comes with ABSOLUTELY NO WARRANTY.
This is free software, and you are welcome to redistribute it
under certain conditions; type `backintime --license' for details.

INFO: Lock
INFO: Include folders: ['/home/xxxxx']
INFO: Ignore folders: []
INFO: Last snapshots: {}
INFO: [GnomePlugin.Systray.run]
INFO: [GnomePlugin.Systray.run] begin loop
INFO: Call rsync to take the snapshot
rsync: extended attributes are not supported on this client
rsync error: syntax or usage error (code 1) at main.c(1423) [client=3.0.5]
WARNING: Command "rsync -aEAX -v --delete-excluded --chmod=Fa-w,D+w --whole-file --delete --exclude="/home/xxxxx/Video/backintime" --exclude="/home/xxxxx/.local/share/backintime" --include="/home/xxxxx/" --include="/home/" --exclude=".*" --exclude="*.backup*" --exclude="*~" --exclude="/home/xxxxx/Video" --include="/home/stijn/**" --exclude="*" / "/home/xxxxx/Video/backintime/backintime/new_snapshot/backup/"" returns 256
INFO: Save permissions
INFO: Remove backups older than: 19991123-000000
INFO: Keep min free disk space: 1024 Mb
Exception in thread Thread-1:
Traceback (most recent call last):
  File "/usr/lib/python2.5/threading.py", line 486, in __bootstrap_inner
    self.run()
  File "/usr/share/backintime/plugins/gnomeplugin.py", line 145, in run
    self.notification.close()
GError: 0 is not a valid notification ID

INFO: Unlock

(and there it stops, no further actions are taken.)