Last change in server properties was enabling flight mode (not sure if thats related though).
I killed the sheep entity that was causing the error, the server worked fine afterwards.
A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------
-- Head --
Thread: Server thread
Stacktrace:
at net.minecraft.network.datasync.EntityDataManager.func_187219_c(EntityDataManager.java:129)
at net.minecraft.network.datasync.EntityDataManager.func_187225_a(EntityDataManager.java:150)
at net.minecraft.entity.EntityLivingBase.func_110143_aJ(EntityLivingBase.java:847)
at com.tmtravlr.potioncore.PotionCoreEventHandler.onLivingUpdate(PotionCoreEventHandler.java:313)
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_144_PotionCoreEventHandler_onLivingUpdate_LivingUpdateEvent.invoke(.dynamic)
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:90)
at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:182)
at net.minecraftforge.common.ForgeHooks.onLivingUpdate(ForgeHooks.java:581)
at net.minecraft.entity.EntityLivingBase.func_70071_h_(EntityLivingBase.java:2095)
at net.minecraft.entity.EntityLiving.func_70071_h_(EntityLiving.java:295)
at net.minecraft.world.World.func_72866_a(World.java:1996)
at net.minecraft.world.WorldServer.func_72866_a(WorldServer.java:832)
at net.minecraft.world.World.func_72870_g(World.java:1958)
-- Entity being ticked --
Details:
Entity Type: minecraft:sheep (net.minecraft.entity.passive.EntitySheep)
Entity ID: 762
Entity Name: ~~ERROR~~ IncompatibleClassChangeError: null
Entity's Exact location: -5986.73, 71.00, -6717.84
Entity's Block location: World: (-5987,71,-6718), Chunk: (at 13,4,2 in -375,-420; contains blocks -6000,0,-6720 to -5985,255,-6705), Region: (-12,-14; contains chunks -384,-448 to -353,-417, blocks -6144,0,-7168 to -5633,255,-6657)
Entity's Momentum: 0.00, -0.08, 0.00
Entity's Passengers: []
Entity's Vehicle: ~~ERROR~~ NullPointerException: null
Stacktrace:
at net.minecraft.world.World.func_72939_s(World.java:1762)
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)
-- System Details --
Details:
Minecraft Version: 1.12.2
Operating System: Linux (amd64) version 4.15.0-135-generic
Java Version: 1.8.0_282, Oracle Corporation
Java VM Version: OpenJDK 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 1204990656 bytes (1149 MB) / 1886912512 bytes (1799 MB) up to 3817865216 bytes (3641 MB)
JVM Flags: 2 total; -Xms128M -Xmx4096M
IntCache: cache: 0, tcache: 0, allocated: 12, tallocated: 94
FML: MCP 9.42 Powered by Forge 14.23.5.2854 111 mods loaded, 111 mods active
States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored
| State | ID | Version | Source | Signature |
|:------ |:--------------------------- |:-------------------- |:--------------------------------------------- |:---------------------------------------- |
| LCHIJA | minecraft | 1.12.2 | minecraft.jar | None |
| LCHIJA | mcp | 9.42 | minecraft.jar | None |
| LCHIJA | FML | 8.0.99.99 | server.jar | e3c3d50c7c986df74c645c0ac54639741c90a557 |
| LCHIJA | forge | 14.23.5.2854 | server.jar | e3c3d50c7c986df74c645c0ac54639741c90a557 |
| LCHIJA | creativecoredummy | 1.0.0 | minecraft.jar | None |
| LCHIJA | itemphysic | 1.4.0 | minecraft.jar | None |
| LCHIJA | ivtoolkit | 1.3.3-1.12 | minecraft.jar | None |
| LCHIJA | foamfixcore | 7.7.4 | minecraft.jar | None |
| LCHIJA | tnt_utilities_core | 1.2.3 | minecraft.jar | None |
| LCHIJA | forgeendertech | 1.12.2-4.5.2.0 | ForgeEndertech-1.12.2-4.5.2.0-build.0459.jar | None |
| LCHIJA | adhooks | 1.12.2-3.2.3.0 | AdHooks-1.12.2-3.2.3.0-build.0435.jar | None |
| LCHIJA | advanced-fishing | 1.3.3 | Advanced-Fishing-1.12.2-1.3.3.jar | None |
| LCHIJA | aireducer | 0.1.3 | AIReducer-1.12.2-0.1.3.jar | None |
| LCHIJA | alcatrazcore | 1.0.4 | alcatrazcore-1.0.4.jar | 3c2d6be715971d1ed58a028cdb3fae72987fc934 |
| LCHIJA | antiqueatlas | 4.6.3 | antiqueatlas-1.12.2-4.6.3.jar | None |
| LCHIJA | anvilpatch | 1.0.0 | anvilpatch-1.0.0.jar | None |
| LCHIJA | aquaculture | 1.6.8 | Aquaculture-1.12.2-1.6.8.jar | None |
| LCHIJA | carrots | 1.0.0b1 | carrotslib-mc1.12.2-1.0.0b1.jar | None |
| LCHIJA | armorunder | 1.0.0 | armorunder-mc1.12.2-1.0.0.jar | None |
| LCHIJA | autoreglib | 1.3-32 | AutoRegLib-1.3-32.jar | None |
| LCHIJA | bacodifficulty | 1.0.3 | BacoDifficulty-1.0.3.jar | None |
| LCHIJA | battletowers | 1.6.5 | BattleTowers-1.12.2.jar | None |
| LCHIJA | baubles | 1.5.2 | Baubles-1.12-1.5.2.jar | None |
| LCHIJA | mujmajnkraftsbettersurvival | 1.4.1 | better_survival-1.4.1.jar | None |
| LCHIJA | bettercombatmod | 1.5.6 | BetterCombat-1.12.2-1.5.6.jar | None |
| LCHIJA | bloodmoon | 1.5.3 | Bloodmoon-MC1.12.2-1.5.3.jar | d72e0dd57935b3e9476212aea0c0df352dd76291 |
| LCHIJA | bnbgaminglib | 2.17.6 | BNBGamingLib-1.12.2-2.17.6.jar | None |
| LCHIJA | bountifulbaubles | 0.0.1 | Bountiful Baubles-1.12.2-0.1.5.jar | None |
| LCHIJA | campfire | 1.2 | campfire-1.12-v1.2.jar | None |
| LCHIJA | carryon | 1.12.3 | CarryOn MC1.12.2 v1.12.3.jar | 55e88f24d04398481ae6f1ce76f65fd776f14227 |
| LCHIJA | toughasnails | 3.1.0.141 | ToughAsNails-1.12.2-3.1.0.141-universal.jar | None |
| LCHIJA | comforts | 1.4.1.3 | comforts-1.12.2-1.4.1.3.jar | 2484ef4d131fdc0dca0647aa21b7b944ddb935a1 |
| LCHIJA | reskillable | 1.12.2-1.13.0 | Reskillable-1.12.2-1.13.0.jar | None |
| LCHIJA | compatskills | 1.12.2-1.17.0 | CompatSkills-1.12.2-1.17.0.jar | None |
| LCHIJA | coralreef | 2.0 | CoralReef-2.5-1.12.2.jar | None |
| LCHIJA | wearablebackpacks | 3.1.4 | WearableBackpacks-1.12.2-3.1.4.jar | None |
| LCHIJA | corpsecomplex | 1.0.10.1 | corpsecomplex-1.12.2-1.0.10.1.jar | 2484ef4d131fdc0dca0647aa21b7b944ddb935a1 |
| LCHIJA | craftablechainmail | 1.0 | craftablechainmail-1.0.jar | None |
| LCHIJA | craftablehorsearmour | 1.3 | CraftableHorseArmour-1.3.0-1.12.jar | None |
| LCHIJA | crafttweaker | 4.1.20 | CraftTweaker2-1.12-4.1.20.jar | None |
| LCHIJA | jei | 4.15.0.291 | jei_1.12.2-4.15.0.291.jar | None |
| LCHIJA | crafttweakerjei | 2.0.3 | CraftTweaker2-1.12-4.1.20.jar | None |
| LCHIJA | creativecore | 1.9.9 | CreativeCore_v1.9.90_mc1.12.2.jar | None |
| LCHIJA | defiledlands | 1.4.3 | defiledlands-1.12.2-1.4.3.jar | None |
| LCHIJA | disenchanter | 1.6 | disenchanter-[1.12]1.6.jar | None |
| LCHIJA | dldungeonsjbg | 1.13.2 | DoomlikeDungeons-1.13.2-MC1.12.2.jar | None |
| LCHIJA | reccomplex | 1.4.8.2 | RecurrentComplex-1.4.8.2.jar | None |
| LCHIJA | dynamictrees | 1.12.2-0.9.7 | DynamicTrees-1.12.2-0.9.7.jar | None |
| LCHIJA | traverse | 1.6.0 | Traverse-1.12.2-1.6.0-69.jar | None |
| LCHIJA | dttraverse | 1.5 | dttraverse-1.5.jar | None |
| LCHIJA | sereneseasons | 1.2.18 | SereneSeasons-1.12.2-1.2.18-universal.jar | None |
| LCHIJA | orelib | 3.6.0.1 | OreLib-1.12.2-3.6.0.1.jar | 7a2128d395ad96ceb9d9030fbd41d035b435753a |
| LCHIJA | dsurround | 3.6.1.0 | DynamicSurroundings-1.12.2-3.6.1.0.jar | 7a2128d395ad96ceb9d9030fbd41d035b435753a |
| LCHIJA | enhancedvisuals | 1.0 | EnhancedVisuals_v1.2.7_mc1.12.2.jar | None |
| LCHIJA | familiarfauna | 1.0.11 | FamiliarFauna-1.12.2-1.0.11.jar | None |
| LCHIJA | firstaid | 1.6.13 | firstaid-1.6.14.jar | 7904c4e13947c8a616c5f39b26bdeba796500722 |
| LCHIJA | foamfix | 0.10.10-1.12.2 | foamfix-0.10.10-1.12.2.jar | None |
| LCHIJA | foodexpansion | 1.3 | FoodExpansion1.3.3-1.12.2.jar | None |
| LCHIJA | forgelin | 1.8.4 | Forgelin-1.8.4.jar | None |
| LCHIJA | tschipplib | 1.1.3 | TschippLib MC1.12.2 v1.1.3.jar | None |
| LCHIJA | forgottenitems | 1.2.1 | ForgottenItems+MC1.12.2+v1.2.1.jar | None |
| LCHIJA | friendlyendermite | 1.0 | FriendlyEndermite_v1.0.1_mc1.12.2.jar | None |
| LCHIJA | globalgamerules | 2.2 | GlobalGameRules-1.12.2-2.2.7.jar | None |
| LCHIJA | grapplemod | 1.12.2-v11.1 | grapplemod-v11.1-1.12.2.jar | None |
| LCHIJA | gravestone | 1.10.3 | gravestone-1.10.3.jar | None |
| LCHIJA | llibrary | 1.7.19 | llibrary-1.7.19-1.12.2.jar | b9f30a813bee3b9dd5652c460310cfcd54f6b7ec |
| LCHIJA | iceandfire | 1.7.1 | iceandfire-1.7.1-1.12.2.jar | None |
| LCHIJA | infernalmobs | 1.7.6 | InfernalMobs-1.12.2.jar | None |
| LCHIJA | inventorytweaks | 1.64+dev.151.822d839 | InventoryTweaks-1.64+dev.151.jar | 55d2cd4f5f0961410bf7b91ef6c6bf00a766dcbe |
| LCHIJA | iseedragons | 0.12 | ISeeDragons-0.12.jar | None |
| LCHIJA | itlt | 1.0.0 | itlt-1.12.2-1.0.2.jar | None |
| LCHIJA | levelup2 | ${version} | Level Up! 2-1.1.23-1.12.jar | None |
| LCHIJA | lostcities | 2.0.22 | lostcities-1.12-2.0.22.jar | None |
| LCHIJA | lostsouls | 1.1.4 | lostsouls-1.12-1.1.4.jar | None |
| LCHIJA | lycanitesmobs | 2.0.7.1 - MC 1.12.2 | lycanitesmobs-1.12.2-2.0.7.1.jar | None |
| LCHIJA | mobends | 0.24 | mobends-0.24_for_MC-1.12.jar | None |
| LCHIJA | multimine | 1.6.2 | MultiMine-1.12.2.jar | None |
| LCHIJA | notreepunching | 2.0.20 | notreepunching-2.0.20.jar | 3c2d6be715971d1ed58a028cdb3fae72987fc934 |
| LCHIJA | potioncore | 1.9_for_1.12.2 | PotionCore-1.9_for_1.12.2.jar | None |
| LCHIJA | potionfingers | r1.0-8 | PotionFingers-r1.0-8.jar | None |
| LCHIJA | qualitytools | 1.0.7_for_1.12.2 | QualityTools-1.0.7_for_1.12.2.jar | None |
| LCHIJA | realistictorches | 2.1.1 | RealisticTorches-1.12.2-2.1.1.jar | None |
| LCHIJA | reborncore | 3.19.3.524 | RebornCore-1.12.2-3.19.3.524-universal.jar | 8727a3141c8ec7f173b87aa78b9b9807867c4e6b |
| LCHIJA | rltweaker | 0.3.0 | RLTweaker-1.12.2-0.3.0.jar | None |
| LCHIJA | roguelike | 1.8.0 | RoguelikeDungeons-1.12.2-1.8.0.jar | None |
| LCHIJA | roughtweaks | 1.0 | roughTweaks0.2.4-1.12.2.jar | None |
| LCHIJA | ruins | 17.2 | Ruins-1.12.2.jar | None |
| LCHIJA | silentlib | 3.0.13 | SilentLib-1.12.2-3.0.14+168.jar | None |
| LCHIJA | scalinghealth | 1.3.37 | ScalingHealth-1.12.2-1.3.42+147.jar | None |
| LCHIJA | sit | v1.3 | sit-1.12.2-v1.3.jar | None |
| LCHIJA | somanyenchantments | 0.4.4 | So+Many+Enchantments+V0.4.4.jar | None |
| LCHIJA | spartanweaponry | beta 1.3.8 | SpartanWeaponry-1.12.2-beta-1.3.8.jar | None |
| LCHIJA | spartanfire | 0.05 | spartanfire-0.05.jar | None |
| LCHIJA | spartanshields | 1.5.4 | SpartanShields-1.12.2-1.5.4.jar | None |
| LCHIJA | spawnercontrol | 1.6.3b | SpawnerControl-1.6.3b.jar | None |
| LCHIJA | stg | 1.12.2-1.2.3 | stg-1.12.2-1.2.3.jar | None |
| LCHIJA | switchbow | 1.5.7 | switchbow-1.5.7.jar | None |
| LCHIJA | tanspit | 1.12.2-1.3 | tanspit-1.12.2-1.4.jar | None |
| LCHIJA | tickprofiler | 1.12-0.0.10 | TickProfiler-1.12-0.0.10.jar | None |
| LCHIJA | tnt_utilities | 1.2.3 | tnt_utilities-mc1.12-1.2.3.jar | None |
| LCHIJA | toolbelt | 1.9.12 | ToolBelt-1.12.2-1.9.12.jar | None |
| LCHIJA | xat | 0.29.2 | Trinkets and Baubles-1.12.2-0.29.2.jar | None |
| LCHIJA | trumpetskeleton | 1.12-1.0.2.1 | trumpetskeleton-1.12-1.0.2.1.jar | None |
| LCHIJA | tumbleweed | 1.12-0.4.7 | tumbleweed-1.12-0.4.7.jar | None |
| LCHIJA | variedcommodities | 1.12.2 | VariedCommodities_1.12.2(21nov19).jar | None |
| LCHIJA | waystones | 4.1.0 | Waystones_1.12.2-4.1.0.jar | None |
| LCHIJA | wolfarmor | 3.4.1.1 | wolfarmor-1.12.2-3.4.1.1-UNIVERSAL-signed.jar | None |
| LCHIJA | xpfromharvest | 1.1.0 | xpfromharvest-1.12.2-1.1.0.jar | None |
| LCHIJA | xpbook | v1.1.4 | xptome-1.12.2-v1.1.4.jar | None |
| LCHIJA | phosphor-lighting | 1.12.2-0.2.6 | phosphor-1.12.2-0.2.6+build50-universal.jar | f0387d288626cc2d937daa504e74af570c52a2f1 |
| LCHIJA | snowrealmagic | 0.3.3 | SnowRealMagic-0.3.3.jar | None |
Loaded coremods (and transformers):
Inventory Tweaks Coremod (InventoryTweaks-1.64+dev.151.jar)
invtweaks.forge.asm.ContainerTransformer
TransformLoader (DynamicSurroundings-1.12.2-3.6.1.0.jar)
LibLoader (# LibLoader.jar)
CreativePatchingLoader (CreativeCore_v1.9.90_mc1.12.2.jar)
SSLoadingPlugin (SereneSeasons-1.12.2-1.2.18-universal.jar)
sereneseasons.asm.transformer.EntityRendererTransformer
sereneseasons.asm.transformer.WorldTransformer
ForgelinPlugin (Forgelin-1.8.4.jar)
Born in a Barn (Born+In+A+Barn+V1.8-1.12-1.1.jar)
com.chocohead.biab.BornInABarn
CoreMod (TickProfiler-1.12-0.0.10.jar)
CorePlugin (ForgeEndertech-1.12.2-4.5.2.0-build.0459.jar)
LoadingPlugin (Bloodmoon-MC1.12.2-1.5.3.jar)
lumien.bloodmoon.asm.ClassTransformer
llibrary (llibrary-core-1.0.11-1.12.2.jar)
net.ilexiconn.llibrary.server.core.plugin.LLibraryTransformer
net.ilexiconn.llibrary.server.core.patcher.LLibraryRuntimePatcher
ItemPatchingLoader (ItemPhysic_Full_1.4.28_mc1.12.2.jar)
com.creativemd.itemphysic.ItemTransformer
PhosphorFMLLoadingPlugin (phosphor-1.12.2-0.2.6+build50-universal.jar)
MMFMLCorePlugin (MultiMine-1.12.2.jar)
atomicstryker.multimine.common.fmlmagic.MMTransformer
Do not report to Forge! (If you haven't disabled the FoamFix coremod, try disabling it in the config! Note that this bit of text will still appear.) (foamfix-0.10.10-1.12.2.jar)
pl.asie.foamfix.coremod.FoamFixTransformer
LoadingPlugin (ResourceLoader-MC1.12.1-1.5.3.jar)
lumien.resourceloader.asm.ClassTransformer
BetterFoliageLoader (BetterFoliage-MC1.12-2.2.0.jar)
mods.betterfoliage.loader.BetterFoliageTransformer
IvToolkit (IvToolkit-1.3.3-1.12.jar)
LoadingPlugin (Reskillable-1.12.2-1.13.0.jar)
codersafterdark.reskillable.base.asm.ClassTransformer
WolfArmorCore (wolfarmor-1.12.2-3.4.1.1-UNIVERSAL-signed.jar)
TNTUtilities Core (tnt_utilities-mc1.12-1.2.3.jar)
ljfa.tntutils.asm.ExplosionTransformer
LoadingPlugin (ChunkAnimator-MC1.12-1.2.jar)
lumien.chunkanimator.asm.ClassTransformer
RebornCore:
Plugin Engine: 0
RebornCore Version: 3.19.3.524
Runtime Debofucsation 1
