Minecraft version: 1.12.2
Wizardry version: 4.3.4
Environment: Server

Issue details: I was at the arcane workbench trying to install the spell book for my staff, but when I clicked "Install" there was an error in the background and the staff failed to install the spell

Link to crash report (if applicable): https://paste.ubuntu.com/p/HpqJM3SN9q/

Looks like the "Compatskills" mod causes it, not wizardry

duplicate of #609