hi! I'm having trouble with this problem as well- I'm literal newbie to hacking. Did you ever find out? If so do you mind telling me? Thanks.
EDIT: NVM I got help.
I get the same error, but for Fire Emblem Fates. Did you find a soultion, and if so how did you solve it? Thank you.
EDIT: Nvm haha I fixed mine. I don't think my file was correctly decrypted, because I redecrypted my game and it worked just fine.