Minecraft: Necesito ayuda con este error

Hola, tuve un error en Minecraft en los últimos días. Quiero abrir un servidor con mods junto con a mis amigos, pero estoy probando los mods y me da un error, el problema es que en esas pruebas con lo poco que aprendí de crasheos, no sé qué genera el crash. Quería saber si alguien sabe qué es el error y si tiene una solución o si el error puede ocurrir si abro un host como quería desde el principio.
Gracias.
PD:Si me lo piden pongo todo el crash report.

]---- Minecraft Crash Report -------- Minecraft Crash Report ----
WARNING: coremods are present: iceandfire (iceandfire-1.8.3 (1).jar) OpenEyePlugin (OpenEye-1.12.2-0.8.jar) CTMCorePlugin (CTM-MC1.12.2-1.0.1.30.jar) TransformLoader (DynamicSurroundings-1.12.2-3.6.0.2.jar) ItemPatchingLoader (ItemPhysic_Full_1.4.27_mc1.12.2 (1).jar) McLib core mod (mclib-1.0.4-1.12.2.jar) CreativePatchingLoader (CreativeCore_v1.9.90_mc1.12.2 (1).jar) ForgelinPlugin (Forgelin-1.8.3.jar) TheBetweenlandsLoadingPlugin (TheBetweenlands-3.5.3-core.jar) llibrary (llibrary-core-1.0.11-1.12.2.jar) MalisisCorePlugin (malisiscore-1.12.2-6.4.0.jar) Inventory Tweaks Coremod (InventoryTweaks-1.63.jar) 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) IvToolkit (IvToolkit-1.3.3-1.12.jar) DLFMLCorePlugin (DynamicLights-1.12.2.jar) ColorUtilityCorePlugin (ColorUtility-universal-1.0.4.jar) LoadingPlugin (ChunkAnimator-MC1.12-1.2.jar)Contact their authors BEFORE contacting forge
// Hi. I'm Minecraft, and I'm a crashaholic.
Time: 2/28/20 7:23 PMDescription: Exception ticking world
java.util.ConcurrentModificationException at java.util.HashMap$HashIterator.nextNode(HashMap.java:1429) at java.util.HashMap$ValueIterator.next(HashMap.java:1458) at net.minecraft.world.chunk.Chunk.func_76623_d(Chunk.java:870) at net.minecraft.world.gen.ChunkProviderServer.func_73156_b(ChunkProviderServer.java:269) at net.minecraft.world.WorldServer.func_72835_b(WorldServer.java:207) at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:756) at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:668) at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:279) at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:526) at java.lang.Thread.run(Thread.java:745)

A detailed walkthrough of the error, its code path and all known details is as follows:---------------------------------------------------------------------------------------
-- Head --Thread: Server threadStacktrace: at java.util.HashMap$HashIterator.nextNode(HashMap.java:1429) at java.util.HashMap$ValueIterator.next(HashMap.java:1458) at net.minecraft.world.chunk.Chunk.func_76623_d(Chunk.java:870) at net.minecraft.world.gen.ChunkProviderServer.func_73156_b(ChunkProviderServer.java:269) at net.minecraft.world.WorldServer.func_72835_b(WorldServer.java:207)
-- Affected level --Details: Level name: Test... All players: 1 total; [EntityPlayerMP['Angeriz'/5337, l='Test...', x=-334.32, y=79.68, z=336.12]] Chunk stats: ServerChunkCache: 962 Drop: 24 Level seed: -6496231842223768796 Level generator: ID 00 - default, ver 1. Features enabled: true Level generator options: Level spawn location: World: (-256,64,220), Chunk: (at 0,4,12 in -16,13; contains blocks -256,0,208 to -241,255,223), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511) Level time: 2913 game time, 2913 day time Level dimension: 0 Level storage version: 0x04ABD - Anvil Level weather: Rain time: 97853 (now: false), thunder time: 118545 (now: false) Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: trueStacktrace: at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:756) at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:668) at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:279) at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:526) at java.lang.Thread.run(Thread.java:745)
-- System Details --Details: Minecraft Version: 1.12.2 Operating System: Windows 10 (amd64) version 10.0 Java Version: 1.8.0_51, Oracle Corporation Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation Memory: 3182431072 bytes (3035 MB) / 8287944704 bytes (7904 MB) up to 8589934592 bytes (8192 MB) JVM Flags: 8 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx8G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=32M IntCache: cache: 7, tcache: 0, allocated: 13, tallocated: 95 FML: MCP 9.42 Powered by Forge 14.23.5.2835 Optifine OptiFine_1.12.2_HD_U_F5 137 mods loaded, 136 mods active States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored