Traceback (most recent call last):
  File "/home/maposmatic/maposmatic/scripts/render.py", line 534, in run
    config.overlays.append(renderer.get_overlay_by_name(overlay))
  File "/home/maposmatic/ocitysmap/ocitysmap/__init__.py", line 409, in get_overlay_by_name
    raise LookupError( 'The requested overlay stylesheet %s was not found!' % name)
LookupError: The requested overlay stylesheet height_contour_overlay was not found!