Error upon completion of first zoom level

[simon-tarr]

This repo hasn't been updated in some time so it's possible there will be no fix for this but, when running gdal2tilesp.py, I get the following error at the end of processing the first zoom level:

Generating Base Tiles:
Generating Overview Tiles:
Traceback (most recent call last):
  File "C:\OSGEO4~1\apps\Python27\Scripts\gdal2tilesp.py", line 2346, in <module>
    tminz = zoom_limits.get(timeout=1)
  File "C:\OSGEO4~1\apps\Python27\lib\multiprocessing\queues.py", line 132, in get
    raise Empty
Queue.Empty

It fails regardless as to the zoom level that run the script at. I Any ideas how I can resolve this?

The regular gdal2tiles script works fine at any zoom level so I do not believe there is an issue with the input raster that I am attempting to tile.

Thanks.