CRASH MC MODDE

Bonjour, notre serveur moddé forge viens de crash. Nous avons le crash log que nous ne parvenons pas a comprendre correctement. L'erreur n'a même pas réellement l'air de venir d'un mod..
Si une personne maîtrisant le sujet, elle est la bienvenue !

Voici le crash log:

Code (cpp):

---- Minecraft Crash Report ----

WARNING: coremods are present:
  MalisisSwitchesPlugin (malisisswitches-1.12.2-5.1.0.jar)
  MalisisCorePlugin (malisiscore-1.12.2-6.4.0.jar)
  Inventory Tweaks Coremod (InventoryTweaks-1.63.jar)
  EnderCorePlugin (EnderCore-1.12.2-0.5.37.jar)
  ForgelinPlugin (Forgelin-1.7.4.jar)
  CTMCorePlugin (CTM-MC1.12.2-0.3.2.18.jar)
  CXLibraryCore (cxlibrary-1.12.1-1.6.1.jar)
  TransformerLoader (OpenComputers-MC1.12.2-1.7.2.67.jar)
  IvToolkit (IvToolkit-1.3.3-1.12.jar)
  llibrary (llibrary-core-1.0.8-1.12.2.jar)
  IELoadingPlugin (ImmersiveEngineering-core-0.12-84.jar)
Contact their authors BEFORE contacting forge

// I bet Cylons wouldn't have this problem.

Time: 8/27/18 1:18 AM
Description: Ticking entity

java.lang.IllegalArgumentException: Cannot get property PropertyInteger{name=level, clazz=class java.lang.Integer, values=[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15]} as it does not exist in BlockStateContainer{block=minecraft:snow_layer, properties=[layers]}
    at net.minecraft.block.state.BlockStateContainer$StateImplementation.func_177229_b(BlockStateContainer.java:201)
    at net.minecraft.world.World.func_72918_a(World.java:2232)
    at cw.entity.yeti.EntityYeti.isOverSnow(EntityYeti.java:554)
    at cw.entity.yeti.EntityYeti.func_70636_d(EntityYeti.java:461)
    at net.minecraft.entity.EntityLivingBase.func_70071_h_(EntityLivingBase.java:2172)
    at net.minecraft.entity.EntityLiving.func_70071_h_(EntityLiving.java:295)
    at cw.entity.yeti.EntityYeti.func_70071_h_(EntityYeti.java:170)
    at net.minecraft.world.World.func_72866_a(World.java:1990)
    at net.minecraft.world.WorldServer.func_72866_a(WorldServer.java:832)
    at net.minecraft.world.World.func_72870_g(World.java:1952)
    at net.minecraft.world.World.func_72939_s(World.java:1756)
    at net.minecraft.world.WorldServer.func_72939_s(WorldServer.java:613)
    at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:767)
    at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:397)
    at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:668)
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:526)
    at java.lang.Thread.run(Thread.java:748)


A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

C'est uniquement la partie la plus importante du crash log. Si vous avez besoin de plus, je reste à disposition.
Dans l'attente, je reste dispo pour toute info complémentaire :)

Bonne journée/soirée !