[Other] Black screen when I open Bag

So the other day I decided that I wanted to make a rom hack. I then wanted to spice things up by adding new stuff to it via mod.exe for pokemon emerald. I added mods and everything seemed alright. but when I opened the bag to catch a pokemon, the screen went black. the music was still playing but it was just a black screen.

I want to assume that it was a mod that did it. if so, which? I wanna know so I can fix it since I spent multiple hours on it.

Remove a mod and test opening the bag one by one till you've found the one causing the issue,.