These are more than likely Deluxe buildings that were not included in the mod package, therefore when non deluxe players try to play, they are missing... The quick fix for this is either for Hoppah to release a patch with them a) included in the patch, so it'll work, or b) removed from the map, for the non deluxe players... And if you really want, you can go into the editor, and replace them yourself for now