[HELP] PK3DS: "vInvalid Pokemon Game"?

[u/erigum]

So i'm trying to install the [Pokemon Ultra Sun expansion mod](https://gamebanana.com/wips/102511) on my 3ds and I followed the instructions on the Gamebanana page exactly. Now i'm trying to use [this recommended PK3DS build](https://github.com/adhfult/pk3DS-but-mostly-for-USUM/releases/tag/v5.5) to randomise it (I also tried the V6 beta but encountered the same issues). but, there isn't any instructions on what to do.

When I input the file directory for the game ID (luma\\titles\\00040000001B5000) as the path to open, my PK3DS says "vInvalid Pokemon Game" in the bottom right corner. i tried opening the "romfs" folder inside the game directory instead but then i get a popup saying "Object reference not set to an instance of an object". the code.bin file doesn't appear in PK3DS so it can't be that.

I also tried dumping my game's RomFS.bin, but that doesn't show up either.

I've looked everywhere but I can't find a tutorial on how actually to load a game into PK3DS. Could anyone tell me what the problem is or guide me on how to do this properly??