I followed every single step of the guide provided here in this site.
I have a Nintendo 2DS (version 220.127.116.11E).
I installed Luma and A9LH (because it said so in the guide), the latest versions I think.
Then when I tried to decrypt my cartridge to do the next steps, my Homebrew Launcher gives that error code. I have an icon on my menu that says "The Homebrew Launcher" and when I click on it, that error code pops up and I dont know why. But I downloaded the Legit Build of Umbra Moon and I managed to do something because my Pokemon Moon is altered except the Wild Encounters. I'm sorry if I cant explain myself properly but I'm portuguese and I dont understand anything about these things