Tutorial ask (Please help)

[Fanfaronts]

Hello, I'm pretty new to the modding community of ffta2 and I was wondering if there was a tutorial to mod games or something ?
I'm roaming threw MelonDS and try to apply patches threw DeltaPatcher or anything really (for ffta2 A Clan's Journey Mod) but keep getting a error message " an error as occured:xdelta3: invalid file name: empty string" and cannot find anything online really.

If there's already a forum I didn't find on how to mod or of this error, sorry for the inconvenience.

(Help me pleaaase  )