Hi there, in StoneBlock modpack and using arcane ensorcellator I've crashed as soon as the process completes right before it output the enchanted book. kinglemming relays this is an Ex Nihilio issue. Could you have a look?

https://pastebin.com/vt9cSNLL

Going to need some more info. What were you trying to do with an arcane ensorcellator and a barrel (I think?)