The Custom Element Handler is a framework which helps certain Stardew Valley mods handle custom object classes (custom items!). Most mods that add new items to your game will also require this mod to function properly. Thankfully, it is compatible with SMAPI, so it’s easy to install!
A note for those that uninstall a mod that uses custom items – you may run into some strange issues! To avoid this, after uninstalling, type ‘
ceh cleanup‘ within the SMAPI console.