Looks like MaterialEffects/Textures/checkers-lightmap.png is missing, which is used in MaterialEffects/Materials/sphLightMapMat.xml. There are checkers-lightmap001.png and checkers-lightmap002.png though.
And in MaterialEffects/Level1.xml, the material is redMat.xml, but the actual file name is RedMat.xml.
And some paths are hard coded, e.g., loading the Level1.xml.
I build and run it and the effects look amazing.