https://mclo.gs/e8nuqSA

My friend and I are having the same issue with this pack. We're trying to play on BMC4 with a bunch of extra mods. The game loads up to 'mod gathering' and then crashes.

Mod list changes beyond the modpack:
Added mods:
alexscaves-2.0.2.jar
alexsmobsinteraction-5.4-all.jar
Apotheosis-1.20.1-7.4.8.jar
ApothicAttributes-1.20.1-1.3.7.jar
ApothicCombat-1.20.1-1.1.0.jar
ApothicCurios-1.20.1-1.0.3e.jar
ArmorPoser-forge-1.20.1-2.2.2.jar
ars_nouveau-1.20.1-4.12.7-all.jar
attributizer-2.1.jar
bendy-lib-forge-4.0.0.jar
betterarcheology-1.2.1-1.20.1.jar
bettercombat-forge-1.8.6+1.20.1.jar
BetterThirdPerson-Forge-1.20-1.9.0.jar
born_in_chaos_[Forge]1.20.1_1.7.jar
cataclysm_ut_lite-AT - 1.20.1.jar
celestisynth-1.20.1-1.3.1.jar
cobweb-forge-1.20.1-1.0.1.jar
common-networking-forge-1.0.5-1.20.1.jar
Critters n' Crawlers-2.2.2-mc1.20.1.jar
crittersandcompanions-forge-2.2.2.jar
domesticationinnovation-1.7.1-1.20.1.jar
dummmmmmy-1.20-2.0.6.jar
emotecraft-for-MC1.20.1-2.2.7-b.build.50-forge.jar
EmoteTweaks-4.0.2.27-forge.jar
exposure-1.20.1-1.7.14-forge.jar
faunify-forge-1.20.1-1.1.2.jar
hallucinatory_plants-2.3.0-1.20.1-forge.jar
Icarus-Forge-2.12.0.jar
integrated_api-1.5.1+1.20.1-forge.jar
irons_spellbooks-1.20.1-3.4.0.9.jar
iwannaskate-1.2.0.jar
l2library-2.5.1.jar
letsdo-API-forge-1.2.15-forge.jar
letsdo-bakery-forge-2.0.5.jar
letsdo-brewery-forge-2.0.3.jar
letsdo-brewery-forge-2.0.5.jar
letsdo-candlelight-forge-2.0.2.jar
letsdo-farm_and_charm-forge-1.0.4.jar
letsdo-herbalbrews-forge-1.0.12.jar
letsdo-nethervinery-forge-1.2.17.jar
letsdo-vinery-forge-1.4.39.jar
modulargolems-2.5.19.jar
mutil-1.20.1-6.2.0.jar
Pehkui-3.8.2+1.20.1-forge.jar
Placebo-1.20.1-8.6.3.jar
player-animation-lib-forge-1.0.2-rc1+1.20.jar
Powah-5.0.10.jar
productivebees-1.20.1-12.6.0.jar
Rats-1.20.1-8.1.3.jar
refinedstorage-1.12.4.jar
refinedstorageaddons-0.10.0.jar
RSInfinityBooster-1.20.1-1.0+41.jar
rsjukeboxes-1.20.1-1.0.1.0.jar
ScorchedGuns-0.4.1-1.20.1.jar
simplyswords-forge-1.56.0-1.20.1.jar
sophisticatedbackpacks-1.20.1-3.23.23.1281.jar
sophisticatedcore-1.20.1-1.2.75.1033.jar
soul-fire-d-forge-1.20.1-4.0.11.jar
supermartijn642configlib-1.1.8-forge-mc1.20.jar
the_bumblezone-7.7.1+1.20.1-forge.jar
the_dirty_stuff-2.1-forge-1.20.1.jar
traveloptics-4.4.0-1.20.1.jar
unusualprehistory-1.5.0.3.jar
voicechat-forge-1.20.1-2.5.30.jar
wits-1.1.0+1.20.1-forge.jar
xercapaint-1.20.1-1.0.1.jar

Updated mods:
azurelib (3.0.8 > 3.0.9)
lithostitched-forge-1.20.1-1.4.10.jar > lithostitched-forge-1.20.1-1.4.11.jar
 

There is an issue with bclib or a mod requiring it

Try other builds of bclib