I dont really have much to add, everything you need to know is in the title lol

---- Minecraft Crash Report ----
// This doesn't make any sense!

Time: 12/21/21, 6:52 PM
Description: Exception ticking world

java.lang.NoSuchFieldError: clientRoll
at com.github.alexthe666.alexsmobs.entity.EntityRockyRoller.(EntityRockyRoller.java:56) ~[alexsmobs-1.15.0.jar%2337!:1.15.0] {re:classloading,pl:runtimedistcleaner:A}
at net.minecraft.world.entity.EntityType.m_20615_(EntityType.java:458) ~[server-1.18.1-20211210.034407-srg.jar%2349!:?] {re:classloading,re:mixin}
at net.minecraft.world.level.NaturalSpawner.m_46988_(NaturalSpawner.java:239) ~[server-1.18.1-20211210.034407-srg.jar%2349!:?] {re:classloading}
at net.minecraft.world.level.NaturalSpawner.m_47038_(NaturalSpawner.java:175) ~[server-1.18.1-20211210.034407-srg.jar%2349!:?] {re:classloading}
at net.minecraft.world.level.NaturalSpawner.m_47045_(NaturalSpawner.java:124) ~[server-1.18.1-20211210.034407-srg.jar%2349!:?] {re:classloading}
at net.minecraft.world.level.NaturalSpawner.m_47029_(NaturalSpawner.java:114) ~[server-1.18.1-20211210.034407-srg.jar%2349!:?] {re:classloading}
at net.minecraft.server.level.ServerChunkCache.m_8490_(ServerChunkCache.java:355) ~[server-1.18.1-20211210.034407-srg.jar%2349!:?] {re:classloading,pl:accesstransformer:B}
at net.minecraft.server.level.ServerChunkCache.m_142483_(ServerChunkCache.java:311) ~[server-1.18.1-20211210.034407-srg.jar%2349!:?] {re:classloading,pl:accesstransformer:B}
at net.minecraft.server.level.ServerLevel.m_8793_(ServerLevel.java:278) ~[server-1.18.1-20211210.034407-srg.jar%2349!:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:immersiveengineering.mixins.json:coremods.ServerWorldMixin,pl:mixin:A}
at net.minecraft.server.MinecraftServer.m_5703_(MinecraftServer.java:868) ~[server-1.18.1-20211210.034407-srg.jar%2349!:?] {re:classloading,pl:accesstransformer:B}
at net.minecraft.server.dedicated.DedicatedServer.m_5703_(DedicatedServer.java:328) ~[server-1.18.1-20211210.034407-srg.jar%2349!:?] {re:classloading,pl:accesstransformer:B}
at net.minecraft.server.MinecraftServer.m_5705_(MinecraftServer.java:808) ~[server-1.18.1-20211210.034407-srg.jar%2349!:?] {re:classloading,pl:accesstransformer:B}
at net.minecraft.server.MinecraftServer.m_130011_(MinecraftServer.java:668) ~[server-1.18.1-20211210.034407-srg.jar%2349!:?] {re:classloading,pl:accesstransformer:B}
at net.minecraft.server.MinecraftServer.m_177918_(MinecraftServer.java:258) ~[server-1.18.1-20211210.034407-srg.jar%2349!:?] {re:classloading,pl:accesstransformer:B}
at java.lang.Thread.run(Thread.java:833) [?:?] {}

I get the same issue when running my server.

Same crash here, it's happened at least four times

Same

This can be quickly fixed by removing the dripstone cave spawn biome so it doesnt spawn.

should be fixed