gkg-3c4c606fcace9e27

I'm trying to create a map, and after watching several videos and reading up I've come as far as creating the actual terrain. Next step in the videos is running the data through PBOProject. After some initial problems with some png files, I've come far enough for it to do the binarize, but I get the warning Map.wrp:validating... warningP:\temp\Map\Map.wrp:EnvSounds quadtree is uncompressed and it stops the generation there. I can't find anything on the 'net about this warning/error ... what do I have to do to fix this? I can't even find any file/directory called EnvSounds ... or entries in the config file ... Help appreciated!