I'm a bit shaky on what files correspond to which. Try this set. If it fails, it could be the problem but could also be a file that is needed when you copy something that references something else. Remember to delete map.rwm.

  • Walls and vegetation
    • descr_walls.txt
    • models_walls folder
    • descr_building_battle folder
    • descr_vegetation*
    • descr_geography.txt
    • vegetation folder