[BUG] Hexcasting won't run when used in conjunction with Spectrum

[Devintrainer]

Describe the bug When trying to boot up any world, I get a server error, despite only playing singleplayer.

To Reproduce Install both Hexcasting and Spectrum, along with all of their dependencies.

Expected behavior A concise description of what you expected to happen.

Minecraft version 1.20.1

Mod version 1.8.2 at the time of finding this bug. It persists into 1.8.3, which I am uwsing now.

Screenshots

Crash Report https://mclo.gs/eQswcnt. Not a crash report, but still something that may help.