What's wrong with my resource pack?

I've followed a tutorial for 1.21.8 resource packs, as far as i'm aware to the letter (barring unique features) trying to make a model for a coin called an omphal. While the pack loads into the game fine, the model seems to not exist, giving me a purple and black cube, ignoring both the parent model and textured model. this is my first time coding anything and I'm really confused as to why it's not working.