Client Crash

---- Minecraft Crash Report ----
// I just don't know what went wrong :(

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

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.client.entity.EntityClientPlayerMP.func_70071_h_(SourceFile:63)
	at net.minecraft.world.World.func_72866_a(World.java:2070)
	at net.minecraft.world.World.func_72870_g(World.java:2034)
	at net.minecraft.world.World.func_72939_s(World.java:1887)
	at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:2006)
	at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:973)
	at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:898)
	at net.minecraft.client.main.Main.main(SourceFile:148)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
	at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at org.multimc.onesix.OneSixLauncher.launchWithMainClass(OneSixLauncher.java:196)
	at org.multimc.onesix.OneSixLauncher.launch(OneSixLauncher.java:231)
	at org.multimc.EntryPoint.listen(EntryPoint.java:143)
	at org.multimc.EntryPoint.main(EntryPoint.java:34)


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.client.entity.EntityClientPlayerMP.func_70071_h_(SourceFile:63)
	at net.minecraft.world.World.func_72866_a(World.java:2070)
	at net.minecraft.world.World.func_72870_g(World.java:2034)
	at net.minecraft.world.World.func_72939_s(World.java:1887)

-- Entity being ticked --
Details:
	Entity Type: null (net.minecraft.client.entity.EntityClientPlayerMP)
	Entity ID: 164
	Entity Name: Gedeon_Grays
	Entity's Exact location: -1011.96, 81.62, 224.13
	Entity's Block location: World: (-1012,81,224), Chunk: (at 12,5,0 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.client.Minecraft.func_71407_l(Minecraft.java:2006)

-- Affected level --
Details:
	Level name: MpServer
	All players: 1 total; [EntityClientPlayerMP['Gedeon_Grays'/164, l='MpServer', x=-1011.96, y=81.62, z=224.13]]
	Chunk stats: MultiplayerChunkCache: 141, 180
	Level seed: 0
	Level generator: ID 00 - default, ver 1. Features enabled: false
	Level generator options:
	Level spawn location: World: (-184,64,252), Chunk: (at 8,4,12 in -12,15; contains blocks -192,0,240 to -177,255,255), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
	Level time: 156786 game time, 156786 day time
	Level dimension: 0
	Level storage version: 0x00000 - Unknown?
	Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
	Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: false
	Forced entities: 38 total; [EntityItem['item.item.pixieDust'/559768, l='MpServer', x=-998.66, y=80.13, z=165.81], EntityCaveSpider['ѕещерный паук'/235409, l='MpServer', x=23.30, y=-0.09, z=9.60], EntityItem['item.item.pixieDust'/574367, l='MpServer', x=-1068.97, y=75.13, z=234.88], EntityClientPlayerMP['Gedeon_Grays'/164, l='MpServer', x=-936.30, y=94.62, z=318.43], EntityItem['item.item.pixieDust'/598956, l='MpServer', x=-977.69, y=80.13, z=171.84], EntityItem['item.item.pixieDust'/702509, l='MpServer', x=-1069.56, y=73.13, z=246.28], EntityIronGolem['∆елезный голем'/237874, l='MpServer', x=-1028.28, y=73.00, z=162.66], EntityAlfheimPixie['ѕикси'/696635, l='MpServer', x=-1061.20, y=88.61, z=248.13], EntityItem['item.item.pixieDust'/592319, l='MpServer', x=-1031.88, y=75.13, z=284.19], EntityItem['item.item.pixieDust'/592318, l='MpServer', x=-1029.91, y=75.13, z=281.75], EntityItem['item.item.pixieDust'/626224, l='MpServer', x=-1010.66, y=78.13, z=282.78], EntityElf['Ёльф'/696630, l='MpServer', x=-1067.50, y=76.00, z=173.50], EntityClientPlayerMP['Gedeon_Grays'/164, l='MpServer', x=-1011.96, y=81.62, z=224.13], EntityAlfheimPixie['ѕикси'/696631, l='MpServer', x=-1048.88, y=79.02, z=238.75], EntityElf['Ёльф'/487736, l='MpServer', x=-989.75, y=75.00, z=189.50], EntityElf['Ёльф'/696629, l='MpServer', x=-1067.50, y=76.00, z=172.50], EntityItem['item.item.pixieDust'/634828, l='MpServer', x=-1016.09, y=77.13, z=284.25], EntityItem['item.item.pixieDust'/592320, l='MpServer', x=-1027.84, y=75.13, z=280.63], EntityItem['item.item.pixieDust'/600903, l='MpServer', x=-972.63, y=72.13, z=190.91], EntityElf['Ёльф'/684123, l='MpServer', x=-1061.69, y=74.00, z=243.44], EntityElf['Ёльф'/684120, l='MpServer', x=-1070.50, y=74.00, z=238.50], EntityItem['item.item.pixieDust'/576861, l='MpServer', x=-1071.25, y=75.13, z=227.59], EntityItem['item.item.pixieDust'/703583, l='MpServer', x=-1056.19, y=74.13, z=265.81], EntityElf['Ёльф'/684124, l='MpServer', x=-1068.50, y=74.00, z=240.50], EntityItem['item.item.pixieDust'/635742, l='MpServer', x=-1017.44, y=77.13, z=283.78], EntityItem['item.item.pixieDust'/593512, l='MpServer', x=-1002.13, y=77.13, z=248.22], EntityItem['item.item.pixieDust'/691560, l='MpServer', x=-952.19, y=78.13, z=228.56], EntityElf['Ёльф'/695150, l='MpServer', x=-1087.50, y=53.00, z=240.50], EntityElf['Ёльф'/695151, l='MpServer', x=-1086.50, y=53.00, z=241.50], EntityItem['item.item.pixieDust'/604143, l='MpServer', x=-979.78, y=80.13, z=182.13], EntityElf['Ёльф'/695148, l='MpServer', x=-1077.50, y=74.00, z=287.50], EntityElf['Ёльф'/695149, l='MpServer', x=-1072.50, y=74.00, z=236.50], EntityItem['item.tile.blockCustomPlant.0'/701155, l='MpServer', x=-1029.47, y=77.58, z=231.09], EntityItem['item.item.pixieDust'/526051, l='MpServer', x=-1068.75, y=97.13, z=164.88], EntityElf['Ёльф'/684411, l='MpServer', x=-1004.50, y=80.00, z=157.50], EntityElf['Ёльф'/695161, l='MpServer', x=-1087.50, y=76.00, z=165.50], EntityElf['Ёльф'/695152, l='MpServer', x=-1086.50, y=53.00, z=240.50], EntityCaveSpider['ѕещерный паук'/234110, l='MpServer', x=25.86, y=-0.08, z=26.01]]
	Retry entities: 0 total; []
	Server brand: fml,forge
	Server type: Integrated singleplayer server
Stacktrace:
	at net.minecraft.client.Minecraft.func_71396_d(Minecraft.java:2444)
	at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:919)
	at net.minecraft.client.main.Main.main(SourceFile:148)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
	at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at org.multimc.onesix.OneSixLauncher.launchWithMainClass(OneSixLauncher.java:196)
	at org.multimc.onesix.OneSixLauncher.launch(OneSixLauncher.java:231)
	at org.multimc.EntryPoint.listen(EntryPoint.java:143)
	at org.multimc.EntryPoint.main(EntryPoint.java:34)