Overviewer Chunk Error

gistfile1.txt

$ ./overviewer.py --config=../config.conf
2014-08-24 07:52:29  Welcome to Minecraft Overviewer!
2014-08-24 07:52:29  Generating textures...
2014-08-24 07:52:42 W Tried several times to read chunk -12,-8. It may be corrupt. Giving up.
2014-08-24 07:52:42 E An error has occurred. This may be a bug. Please let us know!
See http://docs.overviewer.org/en/latest/index.html#help

This is the error that occurred:
Traceback (most recent call last):
  File "./overviewer.py", line 587, in <module>
    ret = main()
  File "./overviewer.py", line 514, in main
    tileSetOpts.update({"spawn": w.find_true_spawn()}) # TODO find a better way to do this
  File "/Users/brian/Downloads/mcmap/overviewer-clone/overviewer_core/world.py", line 201, in find_true_spawn
    chunk = regionset.get_chunk(chunkX, chunkZ)
  File "/Users/brian/Downloads/mcmap/overviewer-clone/overviewer_core/world.py", line 347, in get_chunk
    data = region.load_chunk(x, z)
  File "/Users/brian/Downloads/mcmap/overviewer-clone/overviewer_core/nbt.py", line 307, in load_chunk
    raise CorruptChunkError("Misc error parsing chunk: " + str(e))
CorruptChunkError: Misc error parsing chunk: Error -5 while decompressing data: incomplete or truncated stream