Server Crash

---- Minecraft Crash Report ----
// On the bright side, I bought you a teddy bear!

Time: 6/30/19 1:44 AM
Description: Ticking player

java.lang.IllegalAccessError: tried to access field alfheim.common.core.util.DamageSourceSpell.poison from class net.minecraft.potion.Potion
	at net.minecraft.potion.Potion.func_76394_a(Potion.java:107)
	at net.minecraft.potion.PotionEffect.func_76457_b(PotionEffect.java:125)
	at net.minecraft.potion.PotionEffect.func_76455_a(PotionEffect.java:107)
	at alfheim.common.core.asm.AlfheimHookHandler.updatePotionEffects(AlfheimHookHandler.kt:145)
	at net.minecraft.entity.EntityLivingBase.func_70679_bo(EntityLivingBase.java)
	at net.minecraft.entity.EntityLivingBase.func_70030_z(EntityLivingBase.java:293)
	at net.minecraft.entity.Entity.func_70071_h_(Entity.java:318)
	at net.minecraft.entity.EntityLivingBase.func_70071_h_(EntityLivingBase.java:1561)
	at net.minecraft.entity.player.EntityPlayer.func_70071_h_(EntityPlayer.java:288)
	at net.minecraft.entity.player.EntityPlayerMP.func_71127_g(EntityPlayerMP.java:295)
	at net.minecraft.network.NetHandlerPlayServer.func_147347_a(NetHandlerPlayServer.java:303)
	at net.minecraft.network.play.client.C03PacketPlayer.func_148833_a(SourceFile:137)
	at net.minecraft.network.play.client.C03PacketPlayer.func_148833_a(SourceFile:8)
	at net.minecraft.network.NetworkManager.func_74428_b(NetworkManager.java:212)
	at net.minecraft.network.NetworkSystem.func_151269_c(NetworkSystem.java:165)
	at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:659)
	at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:547)
	at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:186)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:396)
	at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:685)


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

-- Head --
Stacktrace:
	at net.minecraft.potion.Potion.func_76394_a(Potion.java:107)
	at net.minecraft.potion.PotionEffect.func_76457_b(PotionEffect.java:125)
	at net.minecraft.potion.PotionEffect.func_76455_a(PotionEffect.java:107)
	at alfheim.common.core.asm.AlfheimHookHandler.updatePotionEffects(AlfheimHookHandler.kt:145)
	at net.minecraft.entity.EntityLivingBase.func_70679_bo(EntityLivingBase.java)
	at net.minecraft.entity.EntityLivingBase.func_70030_z(EntityLivingBase.java:293)
	at net.minecraft.entity.Entity.func_70071_h_(Entity.java:318)
	at net.minecraft.entity.EntityLivingBase.func_70071_h_(EntityLivingBase.java:1561)
	at net.minecraft.entity.player.EntityPlayer.func_70071_h_(EntityPlayer.java:288)
	at net.minecraft.entity.player.EntityPlayerMP.func_71127_g(EntityPlayerMP.java:295)

-- Player being ticked --
Details:
	Entity Type: null (net.minecraft.entity.player.EntityPlayerMP)
	Entity ID: 164
	Entity Name: Gedeon_Grays
	Entity's Exact location: -1011.94, 80.00, 224.14
	Entity's Block location: World: (-1012,79,224), Chunk: (at 12,4,0 in -64,14; contains blocks -1024,0,224 to -1009,255,239), Region: (-2,0; contains chunks -64,0 to -33,31, blocks -1024,0,0 to -513,255,511)
	Entity's Momentum: 0.00, -0.08, 0.00
Stacktrace:
	at net.minecraft.network.NetHandlerPlayServer.func_147347_a(NetHandlerPlayServer.java:303)
	at net.minecraft.network.play.client.C03PacketPlayer.func_148833_a(SourceFile:137)
	at net.minecraft.network.play.client.C03PacketPlayer.func_148833_a(SourceFile:8)
	at net.minecraft.network.NetworkManager.func_74428_b(NetworkManager.java:212)
	at net.minecraft.network.NetworkSystem.func_151269_c(NetworkSystem.java:165)

-- Ticking connection --
Details:
	Connection: net.minecraft.network.NetworkManager@695e3903
Stacktrace:
	at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:659)
	at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:547)
	at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:186)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:396)
	at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:685)