Hello, help with these error please (Crash Report) 05/08/21

[RodrigoXD]

Hello, I have a mod server that I use to play with my friends, we have been playing for about 2 or 3 days but from one moment to another it closed and I got this error:

---- Minecraft Crash Report ----
// My bad.

Time: 08/05/21 07:45 PM
Description: Ticking entity

java.lang.RuntimeException: Attempted to load class net/minecraft/client/world/ClientWorld for invalid dist DEDICATED_SERVER
    at net.minecraftforge.fml.loading.RuntimeDistCleaner.processClassWithFlags(RuntimeDistCleaner.java:71) ~[forge.jar:36.1] {}
    at cpw.mods.modlauncher.LaunchPluginHandler.offerClassNodeToPlugins(LaunchPluginHandler.java:85) ~[modlauncher-8.0.9.jar:?] {}
    at cpw.mods.modlauncher.ClassTransformer.transform(ClassTransformer.java:120) ~[modlauncher-8.0.9.jar:?] {}
    at cpw.mods.modlauncher.TransformingClassLoader$DelegatedClassLoader.findClass(TransformingClassLoader.java:265) ~[modlauncher-8.0.9.jar:?] {}
    at cpw.mods.modlauncher.TransformingClassLoader.loadClass(TransformingClassLoader.java:136) ~[modlauncher-8.0.9.jar:?] {re:classloading}
    at cpw.mods.modlauncher.TransformingClassLoader.loadClass(TransformingClassLoader.java:98) ~[modlauncher-8.0.9.jar:?] {re:classloading}
    at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_271] {}
    at tallestegg.bigbrain.BigBrainEvents.shieldBash(BigBrainEvents.java:257) ~[bigbrain:1.2.2] {re:classloading}
    at tallestegg.bigbrain.BigBrainEvents.onLivingTick(BigBrainEvents.java:148) ~[bigbrain:1.2.2] {re:classloading}
    at net.minecraftforge.eventbus.ASMEventHandler_32_BigBrainEvents_onLivingTick_LivingUpdateEvent.invoke(.dynamic) ~[?:?] {}
    at net.minecraftforge.eventbus.ASMEventHandler.invoke(ASMEventHandler.java:85) ~[eventbus-4.0.0.jar:?] {}
    at net.minecraftforge.eventbus.EventBus.post(EventBus.java:302) ~[eventbus-4.0.0.jar:?] {}
    at net.minecraftforge.eventbus.EventBus.post(EventBus.java:283) ~[eventbus-4.0.0.jar:?] {}
    at net.minecraftforge.common.ForgeHooks.onLivingUpdate(ForgeHooks.java:339) ~[forge:?] {re:classloading}
    at net.minecraft.entity.LivingEntity.func_70071_h_(LivingEntity.java:2112) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:computing_frames,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:A,pl:runtimedistcleaner:A}
    at net.minecraft.entity.MobEntity.func_70071_h_(MobEntity.java:300) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,xf:OptiFine:default,pl:runtimedistcleaner:A}
    at net.minecraft.world.server.ServerWorld.func_217479_a(ServerWorld.java:611) ~[?:?] {re:mixin,pl:runtimedistcleaner:A,re:classloading,pl:mixin:APP:abnormals_core.mixins.json:ServerWorldMixin,pl:mixin:A,pl:runtimedistcleaner:A}
    at net.minecraft.world.World.func_217390_a(World.java:554) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,xf:fml:twilightforest:hitbox,pl:runtimedistcleaner:A}
    at net.minecraft.world.server.ServerWorld.func_72835_b(ServerWorld.java:404) ~[?:?] {re:mixin,pl:runtimedistcleaner:A,re:classloading,pl:mixin:APP:abnormals_core.mixins.json:ServerWorldMixin,pl:mixin:A,pl:runtimedistcleaner:A}
    at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:851) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:betterendforge.mixins.json:MinecraftServerMixin,pl:mixin:A,pl:runtimedistcleaner:A}
    at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:291) ~[?:?] {re:classloading,pl:accesstransformer:B}
    at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:787) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:betterendforge.mixins.json:MinecraftServerMixin,pl:mixin:A,pl:runtimedistcleaner:A}
    at net.minecraft.server.MinecraftServer.func_240802_v_(MinecraftServer.java:642) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:betterendforge.mixins.json:MinecraftServerMixin,pl:mixin:A,pl:runtimedistcleaner:A}
    at net.minecraft.server.MinecraftServer.func_240783_a_(MinecraftServer.java:232) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:betterendforge.mixins.json:MinecraftServerMixin,pl:mixin:A,pl:runtimedistcleaner:A}
    at java.lang.Thread.run(Unknown Source) [?:1.8.0_271] {}

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

-- Head --
Thread: Server thread
Stacktrace:
    at net.minecraftforge.fml.loading.RuntimeDistCleaner.processClassWithFlags(RuntimeDistCleaner.java:71) ~[forge.jar:36.1] {}
    at cpw.mods.modlauncher.LaunchPluginHandler.offerClassNodeToPlugins(LaunchPluginHandler.java:85) ~[modlauncher-8.0.9.jar:?] {}
    at cpw.mods.modlauncher.ClassTransformer.transform(ClassTransformer.java:120) ~[modlauncher-8.0.9.jar:?] {}
    at cpw.mods.modlauncher.TransformingClassLoader$DelegatedClassLoader.findClass(TransformingClassLoader.java:265) ~[modlauncher-8.0.9.jar:?] {}
    at cpw.mods.modlauncher.TransformingClassLoader.loadClass(TransformingClassLoader.java:136) ~[modlauncher-8.0.9.jar:?] {re:classloading}
    at cpw.mods.modlauncher.TransformingClassLoader.loadClass(TransformingClassLoader.java:98) ~[modlauncher-8.0.9.jar:?] {re:classloading}
    at java.lang.ClassLoader.loadClass(Unknown Source) ~[?:1.8.0_271] {}
    at tallestegg.bigbrain.BigBrainEvents.shieldBash(BigBrainEvents.java:257) ~[bigbrain:1.2.2] {re:classloading}
    at tallestegg.bigbrain.BigBrainEvents.onLivingTick(BigBrainEvents.java:148) ~[bigbrain:1.2.2] {re:classloading}
    at net.minecraftforge.eventbus.ASMEventHandler_32_BigBrainEvents_onLivingTick_LivingUpdateEvent.invoke(.dynamic) ~[?:?] {}
    at net.minecraftforge.eventbus.ASMEventHandler.invoke(ASMEventHandler.java:85) ~[eventbus-4.0.0.jar:?] {}
    at net.minecraftforge.eventbus.EventBus.post(EventBus.java:302) ~[eventbus-4.0.0.jar:?] {}
    at net.minecraftforge.eventbus.EventBus.post(EventBus.java:283) ~[eventbus-4.0.0.jar:?] {}
    at net.minecraftforge.common.ForgeHooks.onLivingUpdate(ForgeHooks.java:339) ~[forge:?] {re:classloading}
    at net.minecraft.entity.LivingEntity.func_70071_h_(LivingEntity.java:2112) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:computing_frames,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:A,pl:runtimedistcleaner:A}
    at net.minecraft.entity.MobEntity.func_70071_h_(MobEntity.java:300) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,xf:OptiFine:default,pl:runtimedistcleaner:A}
    at net.minecraft.world.server.ServerWorld.func_217479_a(ServerWorld.java:611) ~[?:?] {re:mixin,pl:runtimedistcleaner:A,re:classloading,pl:mixin:APP:abnormals_core.mixins.json:ServerWorldMixin,pl:mixin:A,pl:runtimedistcleaner:A}
-- Entity being ticked --
Details:
    Entity Type: minecraft:piglin_brute (net.minecraft.entity.monster.piglin.PiglinBruteEntity)
    Entity ID: 274
    Entity Name: Piglin Brute
    Entity's Exact location: 21.47, 34.77, 137.29
    Entity's Block location: World: (21,34,137), Chunk: (at 5,2,9 in 1,8; contains blocks 16,0,128 to 31,255,143), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
    Entity's Momentum: -0.51, -0.23, -0.80
    Entity's Passengers: []
    Entity's Vehicle: ~~ERROR~~ NullPointerException: null
Stacktrace:
    at net.minecraft.world.World.func_217390_a(World.java:554) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,xf:fml:twilightforest:hitbox,pl:runtimedistcleaner:A}
    at net.minecraft.world.server.ServerWorld.func_72835_b(ServerWorld.java:404) ~[?:?] {re:mixin,pl:runtimedistcleaner:A,re:classloading,pl:mixin:APP:abnormals_core.mixins.json:ServerWorldMixin,pl:mixin:A,pl:runtimedistcleaner:A}

-- Affected level --
Details:
    All players: 1 total; [ServerPlayerEntity['xXRotXx'/183, l='ServerLevel[world]', x=-22.71, y=55.00, z=105.70]]
    Chunk stats: ServerChunkCache: 1204
    Level dimension: minecraft:the_nether
    Derived: true
    Level spawn location: World: (-224,70,64), Chunk: (at 0,4,0 in -14,4; contains blocks -224,0,64 to -209,255,79), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
    Level time: 701965 game time, 709335 day time
    Level name: world
    Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: false
    Level weather: Rain time: 65097 (now: false), thunder time: 38041 (now: false)
    Known server brands: forge
    Level was modded: true
    Level storage version: 0x04ABD - Anvil
Stacktrace:
    at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:851) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:betterendforge.mixins.json:MinecraftServerMixin,pl:mixin:A,pl:runtimedistcleaner:A}
    at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:291) ~[?:?] {re:classloading,pl:accesstransformer:B}
    at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:787) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:betterendforge.mixins.json:MinecraftServerMixin,pl:mixin:A,pl:runtimedistcleaner:A}
    at net.minecraft.server.MinecraftServer.func_240802_v_(MinecraftServer.java:642) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:betterendforge.mixins.json:MinecraftServerMixin,pl:mixin:A,pl:runtimedistcleaner:A}
    at net.minecraft.server.MinecraftServer.func_240783_a_(MinecraftServer.java:232) ~[?:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:betterendforge.mixins.json:MinecraftServerMixin,pl:mixin:A,pl:runtimedistcleaner:A}
    at java.lang.Thread.run(Unknown Source) [?:1.8.0_271] {}

-- System Details --
Details:
    Minecraft Version: 1.16.5
    Minecraft Version ID: 1.16.5
    Operating System: Windows 10 (amd64) version 10.0
    Java Version: 1.8.0_271, Oracle Corporation
    Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
    Memory: 16251564408 bytes (15498 MB) / 17033068544 bytes (16244 MB) up to 17033068544 bytes (16244 MB)
    CPUs: 12
    JVM Flags: 1 total; -Xms16384M
    ModLauncher: 8.0.9+86+master.3cf110c
    ModLauncher launch target: fmlserver
    ModLauncher naming: srg
    ModLauncher services: 
        /mixin-0.8.2.jar mixin PLUGINSERVICE 
        /eventbus-4.0.0.jar eventbus PLUGINSERVICE 
        /forge.jar object_holder_definalize PLUGINSERVICE 
        /forge.jar runtime_enum_extender PLUGINSERVICE 
        /accesstransformers-3.0.1.jar accesstransformer PLUGINSERVICE 
        /forge.jar capability_inject_definalize PLUGINSERVICE 
        /forge.jar runtimedistcleaner PLUGINSERVICE 
        /mixin-0.8.2.jar mixin TRANSFORMATIONSERVICE 
        /OptiFine_1.16.5_HD_U_G7%20(1).jar OptiFine TRANSFORMATIONSERVICE 
        /forge.jar fml TRANSFORMATIONSERVICE 
    FML: 36.1
    Forge: net.minecraftforge:36.1.16
    FML Language Providers: 
        [email protected]
        minecraft@1
    Mod List: 
        forge-1.16.5-36.1.16-server.jar                   |Minecraft                     |minecraft                     |1.16.5              |DONE      |NOSIGNATURE
        useful_backpacks-1.16.5-1.12.0.89.jar             |Useful Backpacks              |usefulbackpacks               |1.12.0.89           |DONE      |f4:a6:0b:ee:cb:8a:1a:ea:9f:9d:45:91:8f:8b:b3:ae:26:f3:bf:05:86:1d:90:9e:f6:32:2a:1a:ed:1d:ce:b0
        TreeChop-1.16.4-0.12.2.jar                        |HT's TreeChop                 |treechop                      |0.12.2              |DONE      |NOSIGNATURE
        mowziesmobs-1.5.16.jar                            |Mowzie's Mobs                 |mowziesmobs                   |1.5.16              |DONE      |NOSIGNATURE
        DungeonsMod-1.16.3-1.3.15.jar                     |Dungeons Mod                  |dungeonsmod                   |1.16.3-1.3.15       |DONE      |NOSIGNATURE
        BiomesOPlenty-1.16.5-13.1.0.441-universal (1).jar |Biomes O' Plenty              |biomesoplenty                 |1.16.4-13.0.0.439   |DONE      |NOSIGNATURE
        bigbrain-1.2.2.jar                                |Big Brain                     |bigbrain                      |1.2.2               |DONE      |NOSIGNATURE
        projectvibrantjourneys-1.16.5-3.0.1.jar           |Project: Vibrant Journeys     |projectvibrantjourneys        |1.16.5-3.0.1        |DONE      |NOSIGNATURE
        infernal-expansion-forge-1.3.jar                  |Infernal Expansion            |infernalexp                   |Release 1.3         |DONE      |NOSIGNATURE
        jei-1.16.5-7.6.4.87.jar                           |Just Enough Items             |jei                           |7.6.4.87            |DONE      |NOSIGNATURE
        abnormals_core-1.16.5-3.1.1 (1).jar               |Abnormals Core                |abnormals_core                |3.1.1               |DONE      |NOSIGNATURE
        astikorcarts-1.16.5-1.1.1 (1).jar                 |AstikorCarts                  |astikorcarts                  |1.1.1               |DONE      |NOSIGNATURE
        goblintraders-1.3.1-1.16.3 (1).jar                |Goblin Traders                |goblintraders                 |1.3.1               |DONE      |NOSIGNATURE
        upgrade_aquatic-1.16.5-3.1.0.jar                  |Upgrade Aquatic               |upgrade_aquatic               |3.1.0               |DONE      |NOSIGNATURE
        SpartanShields-1.16.4-2.1.1.jar                   |Spartan Shields               |spartanshields                |2.1.1               |DONE      |NOSIGNATURE
        Patchouli-1.16.4-50.jar                           |Patchouli                     |patchouli                     |1.16.4-50           |DONE      |NOSIGNATURE
        BetterCaves-Forge-1.16.4-1.1.1.jar                |YUNG's Better Caves           |bettercaves                   |1.16.4-1.1.1        |DONE      |NOSIGNATURE
        citadel-1.6.2.jar                                 |Citadel                       |citadel                       |1.6.2               |DONE      |NOSIGNATURE
        alexsmobs-1.10.0 (1).jar                          |Alex's Mobs                   |alexsmobs                     |1.10.0              |DONE      |NOSIGNATURE
        StorageDrawers-1.16.3-8.2.2.jar                   |Storage Drawers               |storagedrawers                |8.2.2               |DONE      |NOSIGNATURE
        betteranimals-1.16.4-5.4.1.jar                    |Cyber's Better Animal Models  |betteranimals                 |5.4.1               |DONE      |NOSIGNATURE
        YungsApi-1.16.4-Forge-6.jar                       |YUNG's API                    |yungsapi                      |1.16.4-Forge-6      |DONE      |NOSIGNATURE
        twoplayersonehorse-1.16.4-2.0.2.jar               |2 players 1 horse             |twoplayersonehorse            |1.16.4-2.0.2        |DONE      |NOSIGNATURE
        decorative_blocks-1.16.4-1.7.2.jar                |Decorative Blocks             |decorative_blocks             |1.7.2               |DONE      |NOSIGNATURE
        DungeonCrawl-1.16.3-2.2.4.jar                     |Dungeon Crawl                 |dungeoncrawl                  |2.2.4               |DONE      |NOSIGNATURE
        BetterStrongholds-1.16.4-1.0.1.jar                |YUNG's Better Strongholds     |betterstrongholds             |1.16.4-1.0.1        |DONE      |NOSIGNATURE
        guardvillagers-1.16.5.1.2.4.jar                   |Guard Villagers               |guardvillagers                |1.2.4               |DONE      |NOSIGNATURE
        u_team_core-1.16.5-3.2.1.195.jar                  |U Team Core                   |uteamcore                     |3.2.1.195           |DONE      |f4:a6:0b:ee:cb:8a:1a:ea:9f:9d:45:91:8f:8b:b3:ae:26:f3:bf:05:86:1d:90:9e:f6:32:2a:1a:ed:1d:ce:b0
        SpartanWeaponry-1.16.4-2.1.0-beta-3.jar           |Spartan Weaponry              |spartanweaponry               |2.1.0 beta 3        |DONE      |NOSIGNATURE
        ProgressiveBosses-2.2.0-mc1.16.x.jar              |Progressive Bosses            |progressivebosses             |2.2.0               |DONE      |NOSIGNATURE
        Morpheus-1.16.5-4.2.70.jar                        |Morpheus                      |morpheus                      |4.2.70              |DONE      |NOSIGNATURE
        iceandfire-2.1.6-1.16.4.jar                       |Ice and Fire                  |iceandfire                    |2.1.6-1.16.4        |DONE      |NOSIGNATURE
        BackTools-1.16.5-10.1.0.jar                       |Back Tools                    |backtools                     |10.1.0              |DONE      |NOSIGNATURE
        iChunUtil-1.16.3-10.0.0.jar                       |iChunUtil                     |ichunutil                     |10.0.0              |DONE      |NOSIGNATURE
        illagers_plus-1.16.4v1.3.jar                      |Illagers+                     |illagers_plus                 |1.16.4v1.3          |DONE      |NOSIGNATURE
        forge-1.16.5-36.1.16-universal.jar                |Forge                         |forge                         |36.1.16             |DONE      |22:af:21:d8:19:82:7f:93:94:fe:2b:ac:b7:e4:41:57:68:39:87:b1:a7:5c:c6:44:f9:25:74:21:14:f5:0d:90
        Aquaculture-1.16.5-2.1.18.jar                     |Aquaculture 2                 |aquaculture                   |1.16.5-2.1.18       |DONE      |NOSIGNATURE
        twilightforest-1.16.5-4.0.435-universal.jar       |The Twilight Forest           |twilightforest                |NONE                |DONE      |NOSIGNATURE
        subwild-1.2.1.jar                                 |Subterranean Wilderness       |subwild                       |1.2.1               |DONE      |NOSIGNATURE
        betterendforge-1.16.4-1.5.1 (1).jar               |BetterEnd Forge               |betterendforge                |1.16.4-1.5.1        |DONE      |NOSIGNATURE
        corpse-1.16.5-1.0.4.jar                           |Corpse                        |corpse                        |1.16.5-1.0.4        |DONE      |NOSIGNATURE
        dungeonsarise1.16.5-1.2.68a-HF.jar                |Dungeons Arise                |dungeons_arise                |1.2.68a             |DONE      |NOSIGNATURE
    Crash Report UUID: e44c6da5-54f2-4814-ae21-a2c403e41c40
    Player Count: 1 / 20; [ServerPlayerEntity['xXRotXx'/183, l='ServerLevel[world]', x=-22.71, y=55.00, z=105.70]]
    Data Packs: vanilla, mod:usefulbackpacks, mod:treechop, mod:mowziesmobs (incompatible), mod:dungeonsmod, mod:biomesoplenty, mod:bigbrain, mod:projectvibrantjourneys, mod:infernalexp (incompatible), mod:jei, mod:abnormals_core, mod:astikorcarts, mod:goblintraders, mod:upgrade_aquatic, mod:spartanshields, mod:patchouli (incompatible), mod:bettercaves (incompatible), mod:citadel (incompatible), mod:alexsmobs, mod:storagedrawers (incompatible), mod:betteranimals (incompatible), mod:yungsapi, mod:twoplayersonehorse, mod:decorative_blocks, mod:dungeoncrawl, mod:betterstrongholds, mod:guardvillagers, mod:uteamcore, mod:spartanweaponry, mod:progressivebosses, mod:morpheus (incompatible), mod:iceandfire (incompatible), mod:backtools, mod:ichunutil, mod:illagers_plus, mod:forge, mod:aquaculture (incompatible), mod:twilightforest, mod:subwild, mod:betterendforge, mod:corpse, mod:dungeons_arise
    Is Modded: Definitely; Server brand changed to 'forge'
    Type: Dedicated Server (map_server.txt)