I made a modpack for server with FutureMC. My game's launching fine, but my friend's experiencing some sort of crash, which I don't know how to fix. I searched for same problem online, but there was no solution.
Crash is probably connected to net.minecraft.world.gen.feature.WorldGenBigTree function.
Attaching the latest-log file. Can't provide with crash-report as it simply isn't created.
latest (2).log

Nevermind, he just forgot to delete old modpack. I didn't even think about such simple thing