Can't run Gwibber in Karmic

[Bruno]

Ever since I upgraded to Karmic RC, I can't run Gwibber, either from trunk PPA or from trunk bzr. I've tried to reinstall it and recompile it, but I always get this error:

** (gwibber:16203): WARNING **: Trying to register gtype 'WnckWindowState' as flags when in fact it is of type 'GEnum'

** (gwibber:16203): WARNING **: Trying to register gtype 'WnckWindowActions' as flags when in fact it is of type 'GEnum'

** (gwibber:16203): WARNING **: Trying to register gtype 'WnckWindowMoveResizeMask' as flags when in fact it is of type 'GEnum'
Traceback (most recent call last):
  File "/usr/bin/gwibber", line 57, in <module>
    client.Client()
  File "/usr/lib/python2.6/dist-packages/gwibber/client.py", line 107, in __init__
    self.w = GwibberClient()
  File "/usr/lib/python2.6/dist-packages/gwibber/client.py", line 190, in __init__
    self.setup_ui()
  File "/usr/lib/python2.6/dist-packages/gwibber/client.py", line 237, in setup_ui
    self.account_store.populate_tree()
  File "/usr/lib/python2.6/dist-packages/gwibber/gwui.py", line 162, in populate_tree
    icon = pbfile(resources.icon("gtk-find", use_theme=False))
TypeError: pixbuf_new_from_file() argument 1 must be string, not None

PS: the only desktop environment I have is KDE.