Traceback (most recent call last):
  File "/home/dcbw/Development/olpc/sugar-jhbuild/build/share/sugar/shell/view/home/MeshBox.py", line 255, in _buddy_moved_cb
    self._move_buddy(buddy_model, activity_model)
  File "/home/dcbw/Development/olpc/sugar-jhbuild/build/share/sugar/shell/view/home/MeshBox.py", line 309, in _move_buddy
    self._remove_buddy(buddy_model)
  File "/home/dcbw/Development/olpc/sugar-jhbuild/build/share/sugar/shell/view/home/MeshBox.py", line 300, in _remove_buddy
    self._remove_alone_buddy(buddy_model)
  File "/home/dcbw/Development/olpc/sugar-jhbuild/build/share/sugar/shell/view/home/MeshBox.py", line 294, in _remove_alone_buddy
    self.remove_item(icon)
  File "/home/dcbw/Development/olpc/sugar-jhbuild/build/lib/python2.4/site-packages/sugar/graphics/spreadbox.py", line 118, in remove_item
    info.remove_weight(self._grid)
AttributeError: 'NoneType' object has no attribute 'remove_weight'