ubuntutweak modules compiz.py error

[axel]

I copied this from Ubuntu Tweak error message after I clicked Compiz settings:
Distribution: LinuxMint 10 julia
Application: Ubuntu Tweak 0.5.11
Desktop: gnome

Traceback (most recent call last):
  File "/usr/lib/python2.6/dist-packages/ubuntutweak/mainwindow.py", line 502, in setup_notebook
    page = module()
  File "/usr/lib/python2.6/dist-packages/ubuntutweak/modules/compiz.py", line 325, in __init__
    self.create_interface()
  File "/usr/lib/python2.6/dist-packages/ubuntutweak/modules/compiz.py", line 343, in create_interface
    hbox.pack_start(self.create_edge_setting(), True, False, 0)
  File "/usr/lib/python2.6/dist-packages/ubuntutweak/modules/compiz.py", line 475, in create_edge_setting
    self.TopLeft = self.create_edge_combo_box("TopLeft")
  File "/usr/lib/python2.6/dist-packages/ubuntutweak/modules/compiz.py", line 447, in create_edge_combo_box
    if CompizPlugin.is_available(k, v):
  File "/usr/lib/python2.6/dist-packages/ubuntutweak/modules/compiz.py", line 127, in is_available
    getattr(cls.context.Plugins[name], target).has_key(setting)
  File "compizconfig.pyx", line 945, in compizconfig.Plugin.Display.__get__
  File "compizconfig.pyx", line 766, in compizconfig.Plugin.Update
KeyError: 'active_plugins'

My compiz doesn't work. I can't run 'Normal' desktop effects.