Exception loading model for variant ironbackpacks:backpack_basic_parent#inventory for item "ironbackpacks:basicBackpack", normal location exception:
net.minecraftforge.client.model.ModelLoaderRegistry$LoaderException: Exception loading model ironbackpacks:item/backpack_basic_parent with loader VanillaLoader.INSTANCE, skipping

Caused by: java.io.FileNotFoundException: ironbackpacks:models/item/backpack_basic_parent.json