Can you try deleting (or renaming) the `sdmc:/Nintendo Switch/SD Card/switch/dekopon/sdmc/Nintendo 3DS/00000000000000000000000000000000/00000000000000000000000000000000/title/00040000/001b5000` and `sdmc:/Nintendo Switch/SD Card/switch/dekopon/sdmc/Nintendo 3DS/00000000000000000000000000000000/00000000000000000000000000000000/extdata/00000000/00001B50/` folders? The issue, according to the logs, is something regarding parsing your savefile, and these are the two save locations for Ultra Sun. Be sure not to delete them if you have anything important, and instead just rename them or move them somewhere else.