Models and textures not loading

Made a couple models and textures for the modded server I'm playing on with some friends. Most of them work but a few of them are just no loading and Idk why. the irons_spellbooks part of it is fine. Within the minecraft part I have a few crowns that are made from carved pumpkins and those are working fine meanwhile the items that are made from the knowledge book just don't work. any idea why?