pk3DS: Pokémon 3DS ROM Editor and Randomizer

[ShinySalamence125]

I've been trying to find a way to edit the update information for a Pokemon X rom alongside the main game in hopes of making changes that don't disappear as soon as the updates are installed, but I keep getting this error message whenever I try. I've tried loading the update data on its own as well as combining the files between the main game data and the update data, but I get this message every time. I assume that it's because something involving the romfs folder is missing from the update data, but I honestly don't know for sure. Does anyone know what's going on if it isn't that and if it is that, is there any way to get the romfs data onto the update data so I can properly extract it?