thanks.  I have not edited the scene file but it sounds like I am going to have to edit it to fix the problem :-(

I just looked at the file and these reference come under the prop "GROUND"
Should I remove the whole prop or just teh lines like:

textureMap NO_MAP
bumpMap NO_MAP
reflectionMap NO_MAP
transparencyMap NO_MAP

and also under "shader tree" section, references like:
file NO_MAP

Thanks again!