My Forge-Server is very unstable

I could really use some help, my Forge-Server is really unstable. Sometimes when I join the Server crashes, sometimes when I walk a bit.

I removed some Mods that were causing Errors but that changed nothing and I can`t find a working solution. 

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

Time: 7/3/22, 5:36 PM
Description: Exception ticking world

java.lang.RuntimeException: Failed to load hierarchy member net/minecraft/client/renderer/entity/model/EntityModel
    at cpw.mods.modlauncher.TransformerClassWriter.computeHierarchy(TransformerClassWriter.java:86) ~[modlauncher-5.1.2.jar:?] {}
    at cpw.mods.modlauncher.TransformerClassWriter.access$100(TransformerClassWriter.java:35) ~[modlauncher-5.1.2.jar:?] {}
    at cpw.mods.modlauncher.TransformerClassWriter$SuperCollectingVisitor.visit(TransformerClassWriter.java:129) ~[modlauncher-5.1.2.jar:?] {}
    at org.objectweb.asm.tree.ClassNode.accept(ClassNode.java:340) ~[asm-tree-7.2.jar:7.2] {}
    at cpw.mods.modlauncher.TransformerClassWriter.computeHierarchy(TransformerClassWriter.java:74) ~[modlauncher-5.1.2.jar:?] {}
    at cpw.mods.modlauncher.TransformerClassWriter.<init>(TransformerClassWriter.java:48) ~[modlauncher-5.1.2.jar:?] {}
    at cpw.mods.modlauncher.ClassTransformer.transform(ClassTransformer.java:120) ~[modlauncher-5.1.2.jar:?] {}
    at cpw.mods.modlauncher.TransformingClassLoader$DelegatedClassLoader.findClass(TransformingClassLoader.java:247) ~[modlauncher-5.1.2.jar:?] {}
    at cpw.mods.modlauncher.TransformingClassLoader.loadClass(TransformingClassLoader.java:134) ~[modlauncher-5.1.2.jar:?] {re:classloading}
    at cpw.mods.modlauncher.TransformingClassLoader.loadClass(TransformingClassLoader.java:96) ~[modlauncher-5.1.2.jar:?] {re:classloading}
    at java.lang.ClassLoader.loadClass(ClassLoader.java:522) ~[?:?] {}
    at java.lang.Class.getDeclaringClass0(Native Method) ~[?:?] {}
    at java.lang.Class.isTopLevelClass(Class.java:1693) ~[?:?] {}
    at java.lang.Class.getSimpleBinaryName(Class.java:1678) ~[?:?] {}
    at java.lang.Class.getSimpleName0(Class.java:1562) ~[?:?] {}
    at java.lang.Class.getSimpleName(Class.java:1553) ~[?:?] {}
    at atomicstryker.infernalmobs.common.InfernalMobsCore.checkEntityClassAllowed(InfernalMobsCore.java:318) ~[?:1.15.2.3] {re:classloading}
    at atomicstryker.infernalmobs.common.InfernalMobsCore.isClassAllowed(InfernalMobsCore.java:298) ~[?:1.15.2.3] {re:classloading}
    at atomicstryker.infernalmobs.common.InfernalMobsCore.processEntitySpawn(InfernalMobsCore.java:269) ~[?:1.15.2.3] {re:classloading}
    at atomicstryker.infernalmobs.common.EntityEventHandler.onEntityJoinedWorld(EntityEventHandler.java:38) ~[?:1.15.2.3] {re:classloading}
    at net.minecraftforge.eventbus.ASMEventHandler_83_EntityEventHandler_onEntityJoinedWorld_EntityJoinWorldEvent.invoke(.dynamic) ~[?:?] {}
    at net.minecraftforge.eventbus.ASMEventHandler.invoke(ASMEventHandler.java:80) ~[eventbus-2.2.1-service.jar:?] {}
    at net.minecraftforge.eventbus.EventBus.post(EventBus.java:258) ~[eventbus-2.2.1-service.jar:?] {}
    at net.minecraft.world.server.ServerWorld.func_72838_d(ServerWorld.java:896) ~[?:?] {re:mixin,pl:runtimedistcleaner:A,re:classloading,pl:mixin:APP:cavesandcliffs.mixins.json:common.world.gen.ServerWorldMixin,pl:mixin:A,pl:runtimedistcleaner:A}
    at net.minecraft.world.server.ServerWorld.func_217376_c(ServerWorld.java:837) ~[?:?] {re:mixin,pl:runtimedistcleaner:A,re:classloading,pl:mixin:APP:cavesandcliffs.mixins.json:common.world.gen.ServerWorldMixin,pl:mixin:A,pl:runtimedistcleaner:A}
    at net.minecraft.world.spawner.WorldEntitySpawner.func_226701_a_(WorldEntitySpawner.java:135) ~[?:?] {re:classloading}
    at net.minecraft.world.server.ServerChunkProvider.func_223434_a(SourceFile:406) ~[?:?] {re:classloading,pl:accesstransformer:B}
    at it.unimi.dsi.fastutil.longs.Long2ObjectLinkedOpenHashMap$1.forEach(Long2ObjectLinkedOpenHashMap.java:1661) ~[server-1.15.2-extra.jar:?] {re:classloading}
    at com.google.common.collect.Iterables$UnmodifiableIterable.forEach(Iterables.java:105) ~[server-1.15.2-extra.jar:?] {}
    at net.minecraft.world.server.ServerChunkProvider.func_217220_m(SourceFile:371) ~[?:?] {re:classloading,pl:accesstransformer:B}
    at net.minecraft.world.server.ServerChunkProvider.func_217207_a(SourceFile:340) ~[?:?] {re:classloading,pl:accesstransformer:B}
    at net.minecraft.world.server.ServerWorld.func_72835_b(ServerWorld.java:313) ~[?:?] {re:mixin,pl:runtimedistcleaner:A,re:classloading,pl:mixin:APP:cavesandcliffs.mixins.json:common.world.gen.ServerWorldMixin,pl:mixin:A,pl:runtimedistcleaner:A}
    at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:849) ~[?:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A}
    at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:330) ~[?:?] {re:classloading,pl:accesstransformer:B}
    at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:784) ~[?:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A}
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:637) [?:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A}
    at java.lang.Thread.run(Thread.java:829) [?:?] {}
Caused by: java.io.IOException: Class not found
    at org.objectweb.asm.ClassReader.readStream(ClassReader.java:310) ~[asm-7.2.jar:7.2] {}
    at org.objectweb.asm.ClassReader.<init>(ClassReader.java:283) ~[asm-7.2.jar:7.2] {}
    at cpw.mods.modlauncher.TransformerClassWriter.computeHierarchy(TransformerClassWriter.java:82) ~[modlauncher-5.1.2.jar:?] {}
    ... 36 more

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

-- Head --
Thread: Server thread
Stacktrace:
    at cpw.mods.modlauncher.TransformerClassWriter.computeHierarchy(TransformerClassWriter.java:86)
    at cpw.mods.modlauncher.TransformerClassWriter.access$100(TransformerClassWriter.java:35)
    at cpw.mods.modlauncher.TransformerClassWriter$SuperCollectingVisitor.visit(TransformerClassWriter.java:129)
    at org.objectweb.asm.tree.ClassNode.accept(ClassNode.java:340)
    at cpw.mods.modlauncher.TransformerClassWriter.computeHierarchy(TransformerClassWriter.java:74)
    at cpw.mods.modlauncher.TransformerClassWriter.<init>(TransformerClassWriter.java:48)
    at cpw.mods.modlauncher.ClassTransformer.transform(ClassTransformer.java:120)
    at cpw.mods.modlauncher.TransformingClassLoader$DelegatedClassLoader.findClass(TransformingClassLoader.java:247)
    at cpw.mods.modlauncher.TransformingClassLoader.loadClass(TransformingClassLoader.java:134)
    at cpw.mods.modlauncher.TransformingClassLoader.loadClass(TransformingClassLoader.java:96)
    at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522)
    at java.base/java.lang.Class.getDeclaringClass0(Native Method)
    at java.base/java.lang.Class.isTopLevelClass(Class.java:1693)
    at java.base/java.lang.Class.getSimpleBinaryName(Class.java:1678)
    at java.base/java.lang.Class.getSimpleName0(Class.java:1562)
    at java.base/java.lang.Class.getSimpleName(Class.java:1553)
    at atomicstryker.infernalmobs.common.InfernalMobsCore.checkEntityClassAllowed(InfernalMobsCore.java:318)
    at atomicstryker.infernalmobs.common.InfernalMobsCore.isClassAllowed(InfernalMobsCore.java:298)
    at atomicstryker.infernalmobs.common.InfernalMobsCore.processEntitySpawn(InfernalMobsCore.java:269)
    at atomicstryker.infernalmobs.common.EntityEventHandler.onEntityJoinedWorld(EntityEventHandler.java:38)
    at net.minecraftforge.eventbus.ASMEventHandler_83_EntityEventHandler_onEntityJoinedWorld_EntityJoinWorldEvent.invoke(.dynamic)
    at net.minecraftforge.eventbus.ASMEventHandler.invoke(ASMEventHandler.java:80)
    at net.minecraftforge.eventbus.EventBus.post(EventBus.java:258)
    at net.minecraft.world.server.ServerWorld.func_72838_d(ServerWorld.java:896)
    at net.minecraft.world.server.ServerWorld.func_217376_c(ServerWorld.java:837)
    at net.minecraft.world.spawner.WorldEntitySpawner.func_226701_a_(WorldEntitySpawner.java:135)
    at net.minecraft.world.server.ServerChunkProvider.func_223434_a(SourceFile:406)
    at it.unimi.dsi.fastutil.longs.Long2ObjectLinkedOpenHashMap$1.forEach(Long2ObjectLinkedOpenHashMap.java:1661)
    at com.google.common.collect.Iterables$UnmodifiableIterable.forEach(Iterables.java:105)
    at net.minecraft.world.server.ServerChunkProvider.func_217220_m(SourceFile:371)
    at net.minecraft.world.server.ServerChunkProvider.func_217207_a(SourceFile:340)
    at net.minecraft.world.server.ServerWorld.func_72835_b(ServerWorld.java:313)

-- Affected level --
Details:
    All players: 1 total; [ServerPlayerEntity['xKerkus'/13, l='raid', x=-249.93, y=71.42, z=-1825.95]]
    Chunk stats: ServerChunkCache: 3668
    Level dimension: DimensionType{minecraft:overworld}
    Level name: raid
    Level seed: 402756245078292
    Level generator: ID 00 - default, ver 1. Features enabled: true
    Level generator options: {}
    Level spawn location: World: (0,68,-200), Chunk: (at 0,4,8 in 0,-13; contains blocks 0,0,-208 to 15,255,-193), Region: (0,-1; contains chunks 0,-32 to 31,-1, blocks 0,0,-512 to 511,255,-1)
    Level time: 156292 game time, 156292 day time
    Known server brands: vanilla, forge
    Level was modded: true
    Level storage version: 0x04ABD - Anvil
    Level weather: Rain time: 6713 (now: false), thunder time: 17800 (now: false)
    Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: false
Stacktrace:
    at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:849)
    at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:330)
    at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:784)
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:637)
    at java.base/java.lang.Thread.run(Thread.java:829)

-- System Details --
Details:
    Minecraft Version: 1.15.2
    Minecraft Version ID: 1.15.2
    Operating System: Linux (amd64) version 5.4.0
    Java Version: 11.0.15, Private Build
    Java VM Version: OpenJDK 64-Bit Server VM (mixed mode, sharing), Private Build
    Memory: 6701232504 bytes (6390 MB) / 8598323200 bytes (8200 MB) up to 12884901888 bytes (12288 MB)
    CPUs: 6
    JVM Flags: 2 total; -Xms8192M -Xmx12288M
    ModLauncher: 5.1.2+70+master.2845bb9
    ModLauncher launch target: fmlserver
    ModLauncher naming: srg
    ModLauncher services: 
        /mixin-0.8.2.jar mixin PLUGINSERVICE 
        /eventbus-2.2.1-service.jar eventbus PLUGINSERVICE 
        /forge-1.15.2-31.2.57.jar object_holder_definalize PLUGINSERVICE 
        /forge-1.15.2-31.2.57.jar runtime_enum_extender PLUGINSERVICE 
        /forge-1.15.2-31.2.57.jar capability_inject_definalize PLUGINSERVICE 
        /accesstransformers-2.1.3-shadowed.jar accesstransformer PLUGINSERVICE 
        /forge-1.15.2-31.2.57.jar runtimedistcleaner PLUGINSERVICE 
        /mixin-0.8.2.jar mixin TRANSFORMATIONSERVICE 
        /forge-1.15.2-31.2.57.jar fml TRANSFORMATIONSERVICE 
    FML: 31.2
    Forge: net.minecraftforge:31.2.57
    FML Language Providers: 
        [email protected]
        minecraft@1
    Mod List: 
        forge-1.15.2-31.2.57-server.jar Minecraft {[email protected] DONE}
        FarmersDelight-1.15.2-0.2.4b.jar Farmer's Delight {[email protected] DONE}
        mine-mine-no-mi-1.15.2-0.7.4.jar Mine Mine no Mi {[email protected] DONE}
        SpartanWeaponry-1.15.2-2.0.0-beta-1.jar Spartan Weaponry {[email protected] beta 1 DONE}
        BackTools-1.15.2-8.0.0.jar Back Tools {[email protected] DONE}
        iChunUtil-1.15.2-8.0.3.jar iChunUtil {[email protected] DONE}
        carryon-1.15.2-1.13.0.5.jar Carry On {[email protected] DONE}
        bgcore-1.15.2-3.1.jar BGCore {[email protected] DONE}
        CavesAndCliffsBackport-1.15.2-5.0.jar Caves & Cliffs Backport {[email protected] DONE}
        Abnormals-Core-1.15.2-1.0.6.jar Abnormals Core {[email protected] DONE}
        forge-1.15.2-31.2.57-universal.jar Forge {[email protected] DONE}
        Upgrade-Aquatic-1.15.2-1.7.1.jar Upgrade Aquatic {[email protected] DONE}
        strawgolem-1.15.2-1.9.jar Straw Golem {[email protected] DONE}
        extraboats-1.3.6-1.15.2.jar Extra Boats {[email protected] DONE}
        curios-FORGE-1.15.2-2.0.2.7.jar Curios API {[email protected] DONE}
        Waystones_1.15.2-6.0.2.jar Waystones {[email protected] DONE}
        gravestone-1.17.6.jar Gravestone Mod {[email protected] DONE}
        XaerosWorldMap_1.23.3_Forge_1.15.2.jar Xaero's World Map {[email protected] DONE}
        infernalmobs-1.15.2.3.jar Infernal Mobs {[email protected] DONE}
        dungeonsarise1.15.2-1.2.72b.jar Dungeons Arise {[email protected] DONE}
        comforts-FORGE-1.15.2-2.0.0.3.jar Comforts {[email protected] DONE}
        Sullys-Mod--v0.7--1.15.2--forge.jar Sully's Mod {[email protected] DONE}
        NaturesCompass-1.15.2-1.8.5.jar Nature's Compass {[email protected] DONE}
        Artifacts-1.15.2-2.5.3.jar Artifacts {[email protected] DONE}
    Player Count: 1 / 7; [ServerPlayerEntity['xKerkus'/13, l='raid', x=-249.93, y=71.42, z=-1825.95]]
    Data Packs: mod:farmersdelight, mod:mineminenomi (incompatible), mod:spartanweaponry (incompatible), mod:backtools (incompatible), mod:ichunutil (incompatible), mod:carryon (incompatible), mod:bgcore, mod:cavesandcliffs, mod:abnormals_core, mod:forge (incompatible), mod:upgrade_aquatic (incompatible), mod:strawgolem, mod:extraboats, mod:curios (incompatible), mod:waystones (incompatible), mod:gravestone, mod:xaeroworldmap, mod:infernalmobs (incompatible), mod:dungeons_arise, mod:comforts (incompatible), mod:sullys_mod, mod:naturescompass (incompatible), mod:artifacts, vanilla
    Is Modded: Definitely; Server brand changed to 'forge'
    Type: Dedicated Server (map_server.txt)