Battery status crashes on login

[Kensan]

Battery status crashes on login, giving the errormessage below:

This is AWN testing PPA with the latest update. (Avant Window Navigator 0.4.1-rewrite-bzr743+201009122042)
Using 2.6.32-24-generic kernel and Ubuntu 10.04.
Graphics card: Intel Corporation Mobile 945GM/GMS/GME, 943/940GML Express Integrated Graphics Controller (rev 03)

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Errormessage:

TypeError in Battery Status: super() argument 1 must be type, not classobj

Traceback (most recent call last):
  File "/usr/lib/pymodules/python2.6/awn/extras/awnlib.py", line 1540, in init_start
    applet_class(applet)
  File "/usr/share/avant-window-navigator/applets/battery/battery.py", line 86, in __init__
    self.check_status_cb()
  File "/usr/share/avant-window-navigator/applets/battery/battery.py", line 222, in check_status_cb
    time = self.backend.get_remaining_time()
  File "/usr/share/avant-window-navigator/applets/battery/battery.py", line 446, in get_remaining_time
    return super(UPowerBackend, self).get_discharge_time()
TypeError: super() argument 1 must be type, not classobj