I'm building my own private modpack and so far I have installed 78 different mods, but after Quark and AutoRegLib were installed and using both latest versions specifically I got the message 'errors in currently selected datapacks prevented the world from loading'.

my latest batch of mods includes the following: Ceramics, Chisels & Bits, Comforts, Cosmetic Armor Reworked, Environmental Materials, and of course Quark (the ones which needed Libraries were installed automatically via Overwolf), and before this batch of mods, world creation and world loading worked just fine.

To be fair I worked on Quark's config file, maybe the world doesn't load correctly because of the changes that I've made in the quark-common.toml but I don't believe that's the reason for the error message to pop-up.

Logfile: latest.log Sorry for the .log file, it is too big for Pastebin without an account.
Quark version: Quark-r2.4-308
AutoRegLib version: AutoRegLib-1.6-47
Minecraft version: 1.16.5
Forge version: forge-36.0.54

Changes I've made in Quark's common.toml:
quark-common.txt
All the mods I've installed (1.16.4 mods works on 1.16.5 like for example; Towers of the Wild):
Installed mods.txt

Seems like an issue with Environmental Materials.