If it was a just case of not seeing nested folders then FS wouldn't wouldn't throw that error in the first place. Besides, none of those sceneries are nested to begin with.
You have to point here:
Lake Louise Lodge
Scenery (where all of the .bgl files reside)
FS is not seeing the scenery folders inside of any of the RTMM sceneries, meaning that the pointers were either wrong to begin with, or the folder locations were physically moved on the HDD after installation without changing the pointers in the scenery library as well. As I said above, read the thread that I linked to and also get the Scenery Cfg Editor.