Hello,
when i tried to use this mod the following exception appeared:
// Exception message: java.lang.ClassNotFoundException:
// net.darkhax.bookshelf.registry.RegistryHelper

I am using the forge version 1.16.4 - 35.1.7 and am using a whole buch off other mods too (list available in crash report).

Please reach out to me if you require more information.
Have a nice day :D

The log and crash report are attached below.
crash-2020-12-02_15.39.15-fml.txt
latest.log

Hello,

You're missing the mod Bookshelf. It's listed as a dependency on the CurseForge page.