QGIS Zonal Statistics returns empty?

Does anyone familiar with the QGIS Zonal Statistics tool know why stats calculations might return empty?

Inputs

1. DEM for South Carolina: http://dnr.sc.gov/GIS/descdem.html


2. A vector shapefile: https://s3.amazonaws.com/www.improvz.com/gis/Archive.zip

Desired result: Zonal Statistics calculates elevation on all shapes.

Actual result: Zonal Statistics plugin returns empty values for all fields

QGIS 2.8 on MacOSX.

Answer

Your file "CAD_PARCEL_MP have some topology error (check with menu Vector >"topology checker).

I fix it with the processing tool "fix geometry" in QGIS 3.2, and than it seems working