ROM Hack I need some help

[ant888]

I followed Asia81's tutorial on decrypting and rebuilding a rom (I'm trying with NSMB2) and I ran into a couple of problems.

1st. I keep getting this error: https://www.imageupload.co.uk/image/ZEcX

2nd. I'm trying to use make a .3ds a .cia so I could test from the home menu.

Any help would be good.

Thanks.