Caribou traceback

Traceback (most recent call last):
  File "/usr/bin/caribou", line 56, in <module>
    import caribou.ui.window as window
  File "/usr/lib/python2.7/dist-packages/caribou/ui/window.py", line 28, in <module>
    from gi.repository import Gdk
  File "/usr/lib/python2.7/dist-packages/gi/importer.py", line 76, in load_module
    dynamic_module._load()
  File "/usr/lib/python2.7/dist-packages/gi/module.py", line 242, in _load
    overrides_modules = __import__('gi.overrides', fromlist=[self._namespace])
  File "/usr/lib/python2.7/dist-packages/gi/overrides/Gdk.py", line 111, in <module>
    Gdk.EventType._2BUTTON_PRESS = getattr(Gdk.EventType, "2BUTTON_PRESS")
  File "/usr/lib/python2.7/dist-packages/gi/module.py", line 118, in __getattr__
    wrapper = enum_register_new_gtype_and_add(info)
SystemError: error return without exception set