Creating options for  <module 'AddPotionEffect' from '/home/parabyte/Mcedit/mcedit/filters/AddPotionEffect.pyc'>
Creating options for  <module 'tomtsschem' from '/home/parabyte/Mcedit/mcedit/filters/tomtsschem.pyc'>
Traceback (most recent call last):
  File "/home/parabyte/Mcedit/mcedit/editortools/filter.py", line 32, in _func
    func(*args, **kw)
  File "/home/parabyte/Mcedit/mcedit/editortools/filter.py", line 407, in confirm
    self.editor.addOperation(op)
  File "/home/parabyte/Mcedit/mcedit/leveleditor.py", line 3382, in addOperation
    self.performWithRetry(op)
  File "/home/parabyte/Mcedit/mcedit/leveleditor.py", line 3388, in performWithRetry
    op.perform(self.recordUndo)
  File "/home/parabyte/Mcedit/mcedit/editortools/filter.py", line 315, in perform
    self.undoLevel = self.extractUndo(self.level, self.box)
  File "/home/parabyte/Mcedit/mcedit/editortools/operation.py", line 33, in extractUndo
    return self.extractUndoChunks(level, box.chunkPositions, box.chunkCount)
  File "/home/parabyte/Mcedit/mcedit/editortools/operation.py", line 63, in extractUndoChunks
    raise Can