I am unable to import height maps to terrains within the world editor. When attempting to import a png heightmap the following error is logged. I have removed the specifics of the path.

TERRAIN (E): Height map import failed: cannot read source PNG (C:/[PATH TO PNG HEIGHTMAP])

This occurs whether the import settings are left default or changed.

I have tried the following:

Running the workbench as administrator
Placing the heightmap file within the project folder
Switching Reforger tools from F:\ drive install to C:\ (where the file is located)
Adjusting png pixel size to same as the number of vertices in terrain
Re saving the heightmap file in greyscale
Creating a new terrains both in the same and different projects

Are there any further logs which are more detailed on the exact reason the heightmap cannot be read?