please set the openGLDebugOutput -> enabled config option from RenderLib to true and try to reproduce the issue.
-- Renderlib config isn't even appearing

Describe the bug
-- When Renderlib installed with SmoothEntityLight (SEL) game stop with error

Reproducibility
-- I am able to reproduce this issue each time

To Reproduce

1. Go to 'https://www.curseforge.com/minecraft/mc-mods/smooth-entity-light'
2. Install it to mods folder
3. Launch it with Renderlib installed (any version, tried them all)
4. See error

Screenshots/Videos
-- I'l produce link to pastebin below

Versions
RenderLib: any
Forge: latest 1.12.2 (14.23.5.2860)

Minecraft:
Other mods (necessary to reproduce the bug):
--deleted everything, to clear log, stayed only mixins below
--censoredasm5.18
--mixinbooter-8.6
--configanytime-1.0
--MixinCompat
--Red-Core-0.4
--Renderlib (itself, any version, tried from 1.0.4 to latest)
--SmoothEntityLight-4.0.4-MC1.12.2 (conflicting mod)

Hardware
CPU: 5800x amd
RAM: 32gb
GPU: 6600 xt amd
VRAM: 8 gb

Log File
I really tried to make it on patebin, but pastebin dislike lolis (loliasm I mean)
So I had to upload file itself, sorry
latest.log
and I saw debug log here, so why not
debug.log

I understand, that your mod is bigger and I shell to ask other mod owner for compatibility, but that mod is abandoned, but it is really good, just try it =) and I looked for alternatives, but 1.12.2 community is slowly dying... And I really wanted to see it with nothirium =D

SmoothEntityLight is doing some unusual coremodding. I don't think I can fix this on my end.

As a side note: Nothirium most likely won't be compatible with SmoothEntityLight anyway and adding compatibility would likely require too much work.