Window module fails to load on Xubuntu, Lubuntu

[MoLE]

Distribution: Ubuntu 11.10 oneiric
Application: Ubuntu Tweak 0.7.0-0~bzr1779+20120415~oneiric1
Desktop:xubuntu

Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/ubuntutweak/main.py", line 434, in _load_module
    page = module()
  File "/usr/lib/python2.7/dist-packages/ubuntutweak/tweaks/window.py", line 55, in __init__
    if len(close_pattern.findall(button_value)) == 1 and 'close' in button_value:
TypeError: expected string or buffer