Before you report an issue, make sure these boxes are checked.

• [tick ] Make sure you've got Shadowfacts Forgelin installed.
• [not sure. how can I know? :V ] Make sure you're not reporting something that was just fixed.
• [4.12, from 2 days ago ] Make sure you're not using an old version of LibrarianLib.
• [it's something about NBT, and it worked last version ] Make sure you're not using Optifine or GLSL Shaders, if it's a rendering issue.
• [tick ] Make sure you're using Java 7 or greater.

Something about deserializing hookcaps.

https://pastebin.com/StNXGEnR

I reported it to hooks' comment section, but figured librarianlib has a issues so posted it here too.

This is an issue with LibrarianLib, but I can work around it in Hooked pretty easily. A hotfix is imminent.

The 1.0.2 hotfix of Hooked is currently under review.

Roger, I'll download it next time I close and reload. :)