I’m not sure, I haven’t seen this error before.
What new mods/changes have you made since last time it worked? It looks like you’ve added a fair number of new mods I’m not familiar with. Anything that adds new dimensions?
wait gilded games, did you add the Aether? ah I think it may be the Aether II, try removing that and gildedgames util.
EDIT
Alternatively try this https://www.curseforge.com/minecraft/mc-mods/gilded-game-utils-fix
replace the gilded games util with this version it’s meant to remove threaded lighting.