compiz in ubuntu-tweak bug

[Do, Xuan Phuong]

Ubuntu Natty
error when click on compiz settings in ubuntu-tweak
error:

Distribution: Ubuntu 11.04 natty
Application: Ubuntu Tweak 0.5.11
Desktop: gnome

Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/ubuntutweak/mainwindow.py", line 502, in setup_notebook
    page = module()
  File "/usr/lib/python2.7/dist-packages/ubuntutweak/modules/compiz.py", line 325, in __init__
    self.create_interface()
  File "/usr/lib/python2.7/dist-packages/ubuntutweak/modules/compiz.py", line 351, in create_interface
    self.launcher_autohide = UnityLauncherAutoHide(_('Make the launcher hide automatically after some time inactive'))
  File "/usr/lib/python2.7/dist-packages/ubuntutweak/modules/compiz.py", line 274, in __init__
    self.autohide_setting = CompizSetting(self.plugin, 'launcher_autohide')
  File "/usr/lib/python2.7/dist-packages/ubuntutweak/modules/compiz.py", line 149, in __init__
    self.__setting = self.__plugin.create_setting(key, target)
  File "/usr/lib/python2.7/dist-packages/ubuntutweak/modules/compiz.py", line 144, in create_setting
    return settings[key]
KeyError: 'launcher_autohide'