Ubuntu Tweak won't start in kubuntu 10.10

Distribution: Ubuntu maverick (development branch)
Application: Ubuntu Tweak 0.5.6
Desktop: kde

Traceback (most recent call last):
  File "/usr/bin/ubuntu-tweak", line 110, in <module>
    launcher = TweakLauncher(session_bus, MainWindow())
  File "/usr/lib/python2.6/dist-packages/ubuntutweak/mainwindow.py", line 190, in __init__
    self.update_model()
  File "/usr/lib/python2.6/dist-packages/ubuntutweak/mainwindow.py", line 318, in update_model
    self.LOGO_COLUMN, MLOADER.get_pixbuf(module.__name__),
  File "/usr/lib/python2.6/dist-packages/ubuntutweak/modules/__init__.py", line 76, in get_pixbuf
    pixbuf = icon.get_from_name(module.__icon__, size=24)
  File "/usr/lib/python2.6/dist-packages/ubuntutweak/utils/icon.py", line 30, in get_from_name
    pixbuf = icontheme.load_icon(alter, size, 0)
GError: Icon 'gtk-execute' not present in theme