MCEDIT ERROR 2

[   DEBUG][    pymclevel.block_copy.py:36]:Asked to copy 8 blocks
	from BoundingBox(_Vector(x=766, y=58, z=32), _Vector(x=2, y=2, z=2)) in MCInfdevOldLevel("world")
	to (0, 0, 0) in MCSchematic(shape=(2L, 2L, 2L), materials=Alpha, filename="")
[    INFO][    pymclevel.block_copy.py:59]:Copying 8 blocks from BoundingBox(_Vector(x=766, y=58, z=32), _Vector(x=2, y=2, z=2)) to _Vector(x=0, y=0, z=0)
[   DEBUG][        pymclevel.level.py:469]:Removed 0 entities
[   DEBUG][        pymclevel.level.py:488]:Removed 0 tile entities
[   ERROR][                  root.py:1596]:Exception:
Traceback (most recent call last):
  File "C:\build\bin64\build\mcedit\out00-PYZ.pyz\mceutils", line 56, in _alertException
  File "C:\build\bin64\build\mcedit\out00-PYZ.pyz\editortools.select", line 1139, in copySelection
  File "C:\build\bin64\build\mcedit\out00-PYZ.pyz\editortools.select", line 1175, in _copySelection
  File "C:\build\bin64\build\mcedit\out00-PYZ.pyz\albow.extended_widgets", line 305, in showProgress
  File "C:\build\bin64\build\mcedit\out00-PYZ.pyz\albow.widget", line 550, in present
  File "C:\build\bin64\build\mcedit\out00-PYZ.pyz\albow.root", line 230, in run_modal
  File "C:\build\bin64\build\mcedit\out00-PYZ.pyz\albow.widget", line 798, in gl_draw_all
  File "C:\build\bin64\build\mcedit\out00-PYZ.pyz\albow.widget", line 805, in gl_draw_all
  File "C:\build\bin64\build\mcedit\out00-PYZ.pyz\albow.widget", line 359, in draw_all
  File "C:\build\bin64\build\mcedit\out00-PYZ.pyz\albow.extended_widgets", line 221, in draw
  File "C:\build\bin64\build\mcedit\out00-PYZ.pyz\pymclevel.schematic", line 743, in extractSchematicFromIter
  File "C:\build\bin64\build\mcedit\out00-PYZ.pyz\pymclevel.block_copy", line 143, in copyBlocksFromIter
  File "C:\build\bin64\build\mcedit\out00-PYZ.pyz\pymclevel.level", line 451, in getTileEntitiesInBox
  File "C:\build\bin64\build\mcedit\out00-PYZ.pyz\pymclevel.entity", line 102, in pos
  File "C:\build\bin64\build\mcedit\out00-PYZ.pyz\pymclevel.nbt", line 353, in __getitem__
KeyError: 'Key x not found'