[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.

[GameOnne]

I'm not having this issue, is it possible that other mods contribute to this?

[Devintrainer]

I'm not having this issue, is it possible that other mods contribute to this?

I definitely think this is the case. The problem is, I have no clue what other mod(s) could be causing this!

[Robotgiggle]

Could try a binary search (ie remove half your mods, see if the issue is still present to determine which half has the problem, repeat until you narrow it down)