Texture Blank

I'm trying to create some item models that follow the same modeling that apples and such use. But they keep showing either completely invisible or with texture missing texture. 
I'm using version: 1.21.4
Item Json:
  "model": {
    "type": "minecraft:model",
    "model": "rpanon:item/corpse_starch"
  }
}```

Location: "RPA Test Resource Pack\assets\rpanon\items\corpse_starch.json"

Model Json:
```{
    "parent": "minecraft:item/generated",
    "textures": {
        "layer0": "rpanon:item/corpse_starch"
    }
}```

Location: "RPA Test Resource Pack\assets\rpanon\models\item\corpse_starch.json"

Texture path: "RPA Test Resource Pack\assets\rpanon\textures\item\corpse_starch.png"