Server crash continuously

[celophys]

The crash log:

Time: 2/23/22, 8:18 PM
Description: Ticking entity

java.lang.ClassCastException: class net.minecraft.class_3989 cannot be cast to class net.minecraft.class_1657 (net.minecraft.class_3989 and net.minecraft.class_1657 are in unnamed module of loader net.fabricmc.loader.impl.launch.knot.KnotClassLoader @5f341870)
at net.minecraft.item.ItemStack.handler$znb000$finishUsingItem(ItemStack:1141)
at net.minecraft.item.ItemStack.finishUsing(ItemStack)
at net.minecraft.entity.LivingEntity.consumeItem(LivingEntity:3079)
at net.minecraft.entity.LivingEntity.tickItemStackUsage(LivingEntity:2959)
at net.minecraft.entity.LivingEntity.tickActiveItemStack(LivingEntity:2946)
at net.minecraft.entity.LivingEntity.tick(LivingEntity:2312)
at net.minecraft.entity.mob.MobEntity.tick(MobEntity:345)
at net.minecraft.server.world.ServerWorld.tickEntity(ServerWorld:699)
at net.minecraft.world.World.tickEntity(World:487)
at net.minecraft.server.world.ServerWorld.method_31420(ServerWorld:360)
at net.minecraft.world.EntityList.forEach(EntityList:54)
at net.minecraft.server.world.ServerWorld.tick(ServerWorld:328)
at net.minecraft.server.MinecraftServer.tickWorlds(MinecraftServer:879)
at net.minecraft.server.dedicated.MinecraftDedicatedServer.tickWorlds(MinecraftDedicatedServer:324)
at net.minecraft.server.MinecraftServer.tick(MinecraftServer:823)
at net.minecraft.server.MinecraftServer.runServer(MinecraftServer:684)
at net.minecraft.server.MinecraftServer.method_29739(MinecraftServer:270)
at java.lang.Thread.run(Thread.java:833)

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

-- Head --
Thread: Server thread
Stacktrace:
at net.minecraft.class_1799.handler$znb000$finishUsingItem(class_1799.java:1141)
at net.minecraft.class_1799.method_7910(class_1799.java)
at net.minecraft.class_1309.method_6040(class_1309.java:3079)
at net.minecraft.class_1309.method_37119(class_1309.java:2959)
at net.minecraft.class_1309.method_6076(class_1309.java:2946)
at net.minecraft.class_1309.method_5773(class_1309.java:2312)
at net.minecraft.class_1308.method_5773(class_1308.java:345)
at net.minecraft.class_3218.method_18762(class_3218.java:699)
at net.minecraft.class_1937.method_18472(class_1937.java:487)
at net.minecraft.class_3218.method_31420(class_3218.java:360)
at net.minecraft.class_5574.method_31791(class_5574.java:54)
at net.minecraft.class_3218.method_18765(class_3218.java:328)

-- Entity being ticked --
Details:
Entity Type: minecraft:wandering_trader (net.minecraft.class_3989)
Entity ID: 1099
Entity Name: Wandering Trader
Entity's Exact location: -83.50, 68.00, 14.50
Entity's Block location: World: (-84,68,14), Section: (at 12,4,14 in -6,4,0; chunk contains blocks -96,-64,0 to -81,319,15), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,-64,0 to -1,319,511)
Entity's Momentum: 0.00, -0.08, 0.00
Entity's Passengers: []
Entity's Vehicle: null
Entity NBT: {AbsorptionAmount:0.0f,ActiveEffects:[{Ambient:0b,Amplifier:0b,Duration:3600,Id:14b,ShowIcon:1b,ShowParticles:1b}],Age:0,Air:300s,ArmorDropChances:[0.085f,0.085f,0.085f,0.085f],ArmorItems:[{},{},{},{}],Attributes:[{Base:16.0d,Modifiers:[{Amount:7.186874414237064E-4d,Name:"Random spawn bonus",Operation:1,UUID:[I;764212988,-1642705748,-1525631181,-1010795249]}],Name:"minecraft:generic.follow_range"},{Base:0.699999988079071d,Name:"minecraft:generic.movement_speed"}],BMLootBlock:0b,Brain:{memories:{}},CanPickUpLoot:0b,DeathTime:0s,DespawnDelay:0,FallDistance:0.0f,FallFlying:0b,Fire:-1s,ForcedAge:0,HandDropChances:[0.085f,0.085f],HandItems:[{Count:1b,id:"minecraft:potion",tag:{Potion:"minecraft:invisibility"}},{}],Health:20.0f,HurtByTimestamp:0,HurtTime:0s,Inventory:[],Invulnerable:0b,LeftHanded:0b,Motion:[0.0d,-0.0784000015258789d,0.0d],Offers:{Recipes:[{buy:{Count:4b,id:"minecraft:emerald"},buyB:{Count:1b,id:"minecraft:air"},demand:0,maxUses:5,priceMultiplier:0.05f,rewardExp:1b,sell:{Count:1b,id:"minecraft:slime_ball"},specialPrice:0,uses:0,xp:1},{buy:{Count:2b,id:"minecraft:emerald"},buyB:{Count:1b,id:"minecraft:air"},demand:0,maxUses:5,priceMultiplier:0.05f,rewardExp:1b,sell:{Count:1b,id:"minecraft:glowstone"},specialPrice:0,uses:0,xp:1},{buy:{Count:1b,id:"minecraft:emerald"},buyB:{Count:1b,id:"minecraft:air"},demand:0,maxUses:12,priceMultiplier:0.05f,rewardExp:1b,sell:{Count:3b,id:"minecraft:yellow_dye"},specialPrice:0,uses:0,xp:1},{buy:{Count:1b,id:"minecraft:emerald"},buyB:{Count:1b,id:"minecraft:air"},demand:0,maxUses:5,priceMultiplier:0.05f,rewardExp:1b,sell:{Count:2b,id:"minecraft:lily_pad"},specialPrice:0,uses:0,xp:1},{buy:{Count:1b,id:"minecraft:emerald"},buyB:{Count:1b,id:"minecraft:air"},demand:0,maxUses:12,priceMultiplier:0.05f,rewardExp:1b,sell:{Count:1b,id:"minecraft:red_tulip"},specialPrice:0,uses:0,xp:1},{buy:{Count:5b,id:"minecraft:emerald"},buyB:{Count:1b,id:"minecraft:air"},demand:0,maxUses:4,priceMultiplier:0.05f,rewardExp:1b,sell:{Count:1b,id:"minecraft:tropical_fish_bucket"},specialPrice:0,uses:0,xp:1},{buy:{Count:10b,id:"minecraft:emerald"},buyB:{Count:5b,id:"minecraft:diamond"},demand:0,maxUses:2,priceMultiplier:0.05f,rewardExp:1b,sell:{Count:1b,id:"companion_bats:spirit_shard"},specialPrice:0,uses:0,xp:1}]},OnGround:1b,PersistenceRequired:0b,PortalCooldown:0,Pos:[-83.5d,68.0d,14.5d],Rotation:[-63.150177f,0.0f],Tags:["collective-fabric.checked"],UUID:[I;-1265376492,-447396062,-1777166456,701870280],bm_IsStunted:0b,cardinal_components:{"apoli:powers":{Powers:[]}}}
Stacktrace:
at net.minecraft.class_1937.method_18472(class_1937.java:487)
at net.minecraft.class_3218.method_31420(class_3218.java:360)
at net.minecraft.class_5574.method_31791(class_5574.java:54)
at net.minecraft.class_3218.method_18765(class_3218.java:328)
at net.minecraft.server.MinecraftServer.method_3813(MinecraftServer.java:879)
at net.minecraft.class_3176.method_3813(class_3176.java:324)
at net.minecraft.server.MinecraftServer.method_3748(MinecraftServer.java:823)
at net.minecraft.server.MinecraftServer.method_29741(MinecraftServer.java:684)
at net.minecraft.server.MinecraftServer.method_29739(MinecraftServer.java:270)
at java.base/java.lang.Thread.run(Thread.java:833)

-- Affected level --
Details:
All players: 2 total; [class_3222['Celophy'/219, l='ServerLevel[world]', x=-82.30, y=68.00, z=11.30], class_3222['TragicalWind'/548, l='ServerLevel[world]', x=-132.90, y=63.00, z=393.42]]
Chunk stats: 3652
Level dimension: minecraft:overworld
Level spawn location: World: (-75,72,12), Section: (at 5,8,12 in -5,4,0; chunk contains blocks -80,-64,0 to -65,319,15), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,-64,0 to -1,319,511)
Level time: 2459568 game time, 233522 day time
Level name: world
Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: false
Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
Known server brands: fabric
Level was modded: true
Level storage version: 0x04ABD - Anvil
Stacktrace:
at net.minecraft.server.MinecraftServer.method_3813(MinecraftServer.java:879)
at net.minecraft.class_3176.method_3813(class_3176.java:324)
at net.minecraft.server.MinecraftServer.method_3748(MinecraftServer.java:823)
at net.minecraft.server.MinecraftServer.method_29741(MinecraftServer.java:684)
at net.minecraft.server.MinecraftServer.method_29739(MinecraftServer.java:270)
at java.base/java.lang.Thread.run(Thread.java:833)

-- System Details --
Details:
Minecraft Version: 1.18.1
Minecraft Version ID: 1.18.1
Operating System: Linux (amd64) version 4.19.0-12-amd64
Java Version: 17.0.1, Oracle Corporation
Java VM Version: OpenJDK 64-Bit Server VM (mixed mode, sharing), Oracle Corporation
Memory: 568757048 bytes (542 MiB) / 2957262848 bytes (2820 MiB) up to 31894405120 bytes (30416 MiB)
CPUs: 24
Processor Vendor: GenuineIntel
Processor Name: Intel(R) Xeon(R) CPU X5670 @ 2.93GHz
Identifier: Intel64 Family 6 Model 44 Stepping 2
Microarchitecture: Westmere (Server)
Frequency (GHz): 2.93
Number of physical packages: 2
Number of physical CPUs: 12
Number of logical CPUs: 24
Graphics card #0 name: ASPEED Graphics Family
Graphics card #0 vendor: ASPEED Technology, Inc. (0x1a03)
Graphics card #0 VRAM (MB): 0.00
Graphics card #0 deviceId: 0x2000
Graphics card #0 versionInfo: unknown
Virtual memory max (MB): 77100.75
Virtual memory used (MB): 124874.13
Swap memory total (MB): 4574.00
Swap memory used (MB): 2830.81
JVM Flags: 15 total; -Xms512M -XX:MetaspaceSize=384M -XX:MaxMetaspaceSize=768M -XX:+UseSerialGC -XX:+ParallelRefProcEnabled -XX:MaxGCPauseMillis=200 -XX:+UnlockExperimentalVMOptions -XX:+DisableExplicitGC -XX:InitiatingHeapOccupancyPercent=15 -XX:SurvivorRatio=32 -XX:+PerfDisableSharedMem -XX:MaxTenuringThreshold=1 -XX:UseSSE=4 -XX:SoftMaxHeapSize=512M -XX:InitiatingHeapOccupancyPercent=0
Fabric Mods:
adorn: Adorn 3.3.1+1.18.1
adventurez: AdventureZ 1.4.7
amethystequipment: Amethyst Equipment 1.18.1
apoli: Apoli 2.2.2
architectury: Architectury 3.7.20
basicshields: Basic Shields [Fabric] 1.2.1-1.18.1
bclib: BCLib 1.3.4
betterend: Better End 1.0.2
betternether: Better Nether 6.0.10
biomemakeover: Biome Makeover 1.18.1-1.4.7
boatcontainer: BoatContainer 1.0.4
bountiful: Bountiful 2.0.1
calio: Calio 1.4.2
cardinal-components-base: Cardinal Components API (base) 4.0.0
cardinal-components-entity: Cardinal Components API (entities) 4.0.0
chas: Craftable Horse Armour & Saddle 1.18-1.8-Fabric
chunky: Chunky 1.2.164
cloth-api: Cloth API 3.1.61
cloth-basic-math: cloth-basic-math 0.6.0
cloth-client-events-v0: Cloth Client Events v0 3.1.61
cloth-common-events-v1: Cloth Common Events v1 3.1.61
cloth-config: Cloth Config v6 6.2.57
cloth-datagen-api-v1: Cloth Datagen v1 3.1.61
cloth-utils-v1: Cloth Utils v1 3.1.61
collective-fabric: Collective (Fabric) 4.8
com_electronwill_night-config_core: core 3.6.3
com_electronwill_night-config_toml: toml 3.6.3
com_eliotlash_mclib_mclib: mclib 18
com_eliotlash_molang_molang: molang 18
companion_bats: Companion Bats 1.19.0
copperequipment: Copper Equipment fabric-1.18.1-v2.0.0
creeperoverhaul: Creeper Overhaul 0.3.0
crowdin-translate: CrowdinTranslate 1.4+1.18
direbats: Direbats 2.1.0
doubledoors-fabric: Double Doors (Fabric) 3.1
dual_riders: DualRiders 1.0.5
easymagic: Easy Magic 3.2.1
emeraldequipment: Emerald Equipment 1.18.1
enderitemod: Enderite Mod 1.3.3
enderitestorage: Enderite Reinforced Storage 1.0.0-beta.1+1.18
fabric: Fabric API 0.46.4+1.18
fabric-api-base: Fabric API Base 0.4.2+d7c144a865
fabric-api-lookup-api-v1: Fabric API Lookup API (v1) 1.5.3+d7c144a865
fabric-biome-api-v1: Fabric Biome API (v1) 6.0.2+d7c144a865
fabric-command-api-v1: Fabric Command API (v1) 1.1.7+d7c144a865
fabric-commands-v0: Fabric Commands (v0) 0.2.6+b4f4f6cd65
fabric-containers-v0: Fabric Containers (v0) 0.1.19+d7c144a865
fabric-content-registries-v0: Fabric Content Registries (v0) 0.4.8+d7c144a865
fabric-crash-report-info-v1: Fabric Crash Report Info (v1) 0.1.9+3ac43d9565
fabric-dimensions-v1: Fabric Dimensions API (v1) 2.1.10+a1d9bbf565
fabric-entity-events-v1: Fabric Entity Events (v1) 1.4.6+d7c144a865
fabric-events-interaction-v0: Fabric Events Interaction (v0) 0.4.17+d7c144a865
fabric-events-lifecycle-v0: Fabric Events Lifecycle (v0) 0.2.9+d7c144a865
fabric-game-rule-api-v1: Fabric Game Rule API (v1) 1.0.11+d7c144a865
fabric-item-api-v1: Fabric Item API (v1) 1.3.1+691a79b565
fabric-item-groups-v0: Fabric Item Groups (v0) 0.3.6+3ac43d9565
fabric-language-kotlin: Fabric Language Kotlin 1.7.1+kotlin.1.6.10
fabric-lifecycle-events-v1: Fabric Lifecycle Events (v1) 1.4.13+713c266865
fabric-loot-tables-v1: Fabric Loot Tables (v1) 1.0.9+d7c144a865
fabric-mining-level-api-v1: Fabric Mining Level API (v1) 1.0.6+d7c144a865
fabric-mining-levels-v0: Fabric Mining Levels (v0) 0.1.11+b4f4f6cd65
fabric-networking-api-v1: Fabric Networking API (v1) 1.0.19+d7c144a865
fabric-networking-v0: Fabric Networking (v0) 0.3.6+b4f4f6cd65
fabric-object-builder-api-v1: Fabric Object Builder API (v1) 1.11.4+d7c144a865
fabric-object-builders-v0: Fabric Object Builders (v0) 0.7.12+d7c144a865
fabric-particles-v1: Fabric Particles (v1) 0.2.10+526dc1ac65
fabric-permissions-api-v0: fabric-permissions-api 0.1-SNAPSHOT
fabric-registry-sync-v0: Fabric Registry Sync (v0) 0.9.2+ad01bfbd65
fabric-rendering-data-attachment-v1: Fabric Rendering Data Attachment (v1) 0.3.5+d7c144a865
fabric-rendering-fluids-v1: Fabric Rendering Fluids (v1) 0.1.19+3ac43d9565
fabric-resource-conditions-api-v1: Fabric Resource Conditions API (v1) 1.0.2+d7c144a865
fabric-resource-loader-v0: Fabric Resource Loader (v0) 0.4.14+713c266865
fabric-screen-handler-api-v1: Fabric Screen Handler API (v1) 1.1.12+d7c144a865
fabric-structure-api-v1: Fabric Structure API (v1) 2.1.3+d7c144a865
fabric-tag-extensions-v0: Fabric Tag Extensions (v0) 1.2.8+d7c144a865
fabric-tool-attribute-api-v1: Fabric Tool Attribute API (v1) 1.3.8+fb3b57b465
fabric-transfer-api-v1: Fabric Transfer API (v1) 1.5.9+d7c144a865
fabricloader: Fabric Loader 0.13.2
fabricshieldlib: Fabric Shield Lib 1.5.1-pre1-1.18
feature_nbt_deadlock_be_gone: Feature NBT Deadlock Be Gone - Fabric 1.0.1+1.18.1
fiber: fiber 0.23.0-2
flonters: Flonters 1.3.0+1.18.1
flytre_lib: FlytreLib 1.7.1
forgeconfigapiport: Forge Config API Port 3.1.1
geckolib3: Geckolib 3.0.32
glassdoor: Glass Doors 2.1.0+1.18
graveyard: The Graveyard 1.5
guardvillagers: Guard Villagers Fabric 1.0.7
hologram-api: Hologram API 0.2.1+1.18-pre5
hookshot: Hookshot 24.0
hplus: Hopper Plus 3.1.2
impaled: Impaled 1.0.2
java: OpenJDK 64-Bit Server VM 17
kambrik: Kambrik 3.0.1-1.18
libcd: LibCapableData 3.0.3+1.16.3
lithium: Lithium 0.7.7
magna: Magna 1.7.0-1.18-pre1
mannequins: Mannequins 2.0.0
maybe-data: Maybe data 1.0.1-1.17
medievalweapons: Medieval Weapons 1.1.7
megaparrot: Megaparrot 1.0.3
minecraft: Minecraft 1.18.1
mm: Manningham Mills 2.3
moretags: More Tags 2.0.3
morevillagers-fabric: MoreVillagersFabric 3.1.1-SNAPSHOT
no_null_processors: No Null Processors - Fabric 2.0.1+1.18.1
notenoughcrashes: Not Enough Crashes 4.1.4+1.18.1
obsidianequipment: Obsidian Equipment 1.18.1
omega-config: OmegaConfig 1.2.3-1.18.1
org_jetbrains_kotlin_kotlin-reflect: kotlin-reflect 1.6.10
org_jetbrains_kotlin_kotlin-stdlib: kotlin-stdlib 1.6.10
org_jetbrains_kotlin_kotlin-stdlib-jdk7: kotlin-stdlib-jdk7 1.6.10
org_jetbrains_kotlin_kotlin-stdlib-jdk8: kotlin-stdlib-jdk8 1.6.10
org_jetbrains_kotlinx_kotlinx-coroutines-core-jvm: kotlinx-coroutines-core-jvm 1.5.2
org_jetbrains_kotlinx_kotlinx-coroutines-jdk8: kotlinx-coroutines-jdk8 1.5.2
org_jetbrains_kotlinx_kotlinx-serialization-cbor-jvm: kotlinx-serialization-cbor-jvm 1.3.1
org_jetbrains_kotlinx_kotlinx-serialization-core-jvm: kotlinx-serialization-core-jvm 1.3.1
org_jetbrains_kotlinx_kotlinx-serialization-json-jvm: kotlinx-serialization-json-jvm 1.3.1
origins: Origins 1.3.1
origins-classes: Origins: Classes 1.2.4
oxidized: Oxidized 1.6.1
packet_tweaker: Packet Tweaker 0.2.0+1.18-pre1
phosphor: Phosphor 0.8.1
placeholder-api: Placeholder API 1.1.3+1.17.1
playerabilitylib: Pal 1.3.0
pollen: Pollen 1.0.0
polymer: Polymer (Core) 0.2.0-beta.24+1.18.1
polymer-legacy: Polymer (Compatibility) 0.1.9+0.2.0-beta.24+1.18.1
pugh_tools: Pugh Tools 1.1.17
puzzleslib: Puzzles Lib 3.1.5
reach-entity-attributes: Reach Entity Attributes 2.1.1
reinfbarrel: Reinforced Barrels 2.0.0-beta.1+1.18
reinfchest: Reinforced Chests 2.0.0-beta.2+1.18
reinfcore: Reinforced Core 2.0.0-beta.1+1.18
reinfshulker: Reinforced Shulker Boxes 2.0.0-beta.2+1.18
repurposed_structures: Repurposed Structures 3.3.12+1.18.1
sandwichable: Sandwichable 1.2-rc4+1.18
server_translations_api: Server Translations API 1.4.8+1.18-pre1
sgui: sgui 1.0.0-rc6+1.18-pre5
simple_backpack: SimpleBackpack 1.2.30
skeletonhorsespawn-fabric: Skeleton Horse Spawn (Fabric) 1.9
static-content: Static Content 1.0.2-1.16.2
staticdata: Static Data 1.1.2
stoneholm: Stoneholm 1.4.2
subterrestrial: Subterrestrial 1.0.1
totw_additions: Towers of the Wild: Additions 1.1.0
towers_of_the_wild_reworked: Towers of the Wild: Reworked 2.1.1
trapexpansion: Trap Expansion 1.3.3
treeaxe: The TreeAxe 1.1.32
twigs: Twigs 1.1.2
universal-graves: Universal Graves 2.0.0-rc.4+1.18.1
vanilla-hammers: Vanilla Hammers 3.2.0-1.18.1
vanillaexcavators: Vanilla Excavators 1.1.0
voicechat: Simple Voice Chat 1.18.1-2.2.16
wildworld: Wild World 3.1.0+1.18
wolveswitharmor: Wolves With Armor 1.7.0-1.18
zombiehorsespawn-fabric: Zombie Horse Spawn (Fabric) 3.0
Server Running: true
Player Count: 2 / 100; [class_3222['Celophy'/219, l='ServerLevel[world]', x=-82.30, y=68.00, z=11.30], class_3222['TragicalWind'/548, l='ServerLevel[world]', x=-132.90, y=63.00, z=393.42]]
Data Packs: vanilla, Fabric Mods
Is Modded: Definitely; Server brand changed to 'fabric'
Type: Dedicated Server (map_server.txt)
Suspected Mods: Minecraft (minecraft)

[warjort]

java.lang.ClassCastException: class net.minecraft.class_3989 cannot be cast to class net.minecraft.class_1657 (net.minecraft.class_3989 and net.minecraft.class_1657 are in unnamed module of loader net.fabricmc.loader.impl.launch.knot.KnotClassLoader @5f341870)
at net.minecraft.item.ItemStack.handler$znb000$finishUsingItem(ItemStack:1141)

class_3989 = WanderTraderEntity
class_1657 = PlayerEntity

You have a mod using a mixin for an ItemStack that thinks a wandering trader is a player.
Or probably more accurately, it falsely assumes that only players use items.

Whoever wrote this mod didn't include their mod name in the mixin name and just called it "finishUsingItem".
So we can only guess which mod it is.
The usual way is remove mods in a test environment until the find the problem mod, but that is a difficult approach if you can't reproduce the circumstances of the crash.

[celophys]

Thanks for your help, i will try it!

[warjort]

This says it is in the collective-fabric mod and fixed in version 4.9 (you have 4.8)
Serilum/.issue-tracker#950