Worlds Keep Corrupting (Failed to load datapacks, can't proceed with server load. You can either fix your datapacks or reset to vanilla with --safeMode)

[dacanius]

So I usually am able to figure out crashes/issues myself but I kinda got stuck with this one so I thought I'd ask for some help here. Whenever I create a new world in my testing instance of my custom modpack it loads at first but as soon as I leave the game and re-enter the world corrupts giving the above message. The same (corruption) goes for any old worlds too.

Minecraft 1.21.1 (Custom Modpack)

Thanks for any help :)

latest.log
debug.log

[ChiefArug]

I can't see anythig in there that points to an immediate cause unfortunately.

It is probably one of your worldgen mods, but I can't tell which.
End's Phantasm is mentioned right before the error, so its worth a shot as the first one to remove, otherwise methodically work your way through your worldgen mods and libraries (or try a binary search, halving the mod list until it works then adding halves back and repeating to find the cause).

[dacanius]

Yeah, that's what I feared. Will go through the worldgen mods and see what I can find out. Thanks!