Traceback (most recent call last):
  File "/usr/bin/unity-tweak-tool", line 56, in <module>
    UnityTweakTool.init()
  File "/usr/lib/python3/dist-packages/UnityTweakTool/__init__.py", line 135, in init
    connectpages()
  File "/usr/lib/python3/dist-packages/UnityTweakTool/__init__.py", line 57, in connectpages
    from UnityTweakTool.section.system import System
  File "/usr/lib/python3/dist-packages/UnityTweakTool/section/system.py", line 166, in <module>
    'cbox_overlay_scrollbar_mode']
  File "/usr/lib/python3/dist-packages/UnityTweakTool/elements/radio.py", line 54, in __init__
    key=self.key
AssertionError