Hello I'm having the same issue, I am running my own modpack and the world was working fine i played for about 2 days but one day i load it up and this happens
Here is the crash log
---- Minecraft Crash Report ----
WARNING: coremods are present:
IELoadingPlugin (ImmersiveEngineering-core-0.12-98.jar)
SSLoadingPlugin (SereneSeasons-1.12.2-1.2.18-universal.jar)
TransformLoader (DynamicSurroundings-1.12.2-3.6.1.0 (1).jar)
MovingWorldCore (movingworld-1.12-6.353-full.jar)
MicdoodlePlugin (MicdoodleCore-1.12.2-4.0.2.280.jar)
BetterFoliageLoader (BetterFoliage-MC1.12-2.3.1 (2).jar)
ObfuscatePlugin (obfuscate-0.2.6-1.12.2.jar)
Quark Plugin (Quark-r1.6-179.jar)
CTMCorePlugin (CTM-MC1.12.2-1.0.2.31.jar)
ForgelinPlugin (Forgelin-1.8.3 (1).jar)
WolfArmorCore (wolfarmor-1.12.2-3.7.5-universal-signed.jar)
Real item drops plugin (RealisticItemDropsAddon-0.1.1.jar)
XaeroMinimapPlugin (Xaeros_Minimap_21.4.1_Forge_1.12.jar)
MalisisCorePlugin (malisiscore-1.12.2-6.5.1.jar)
CreativePatchingLoader (CreativeCore_v1.10.47_mc1.12.2.jar)
IvToolkit (IvToolkit-1.3.3-1.12.jar)
LoadingPlugin (ChunkAnimator-MC1.12-1.2.jar)
Contact their authors BEFORE contacting forge
// Why did you do that?
Time: 3/7/21 3:14 PM
Description: Exception in server tick loop
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.World.func_147448_a(World.java:1949)
at net.minecraft.world.chunk.Chunk.func_76631_c(Chunk.java:856)
at net.minecraftforge.common.chunkio.ChunkIOProvider.syncCallback(ChunkIOProvider.java:109)
at net.minecraftforge.common.chunkio.ChunkIOExecutor.tick(ChunkIOExecutor.java:150)
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:728)
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:
---------------------------------------------------------------------------------------
-- 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: 1196116128 bytes (1140 MB) / 4998037504 bytes (4766 MB) up to 7546077184 bytes (7196 MB)
JVM Flags: 4 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx8096m -Xms256m -XX:PermSize=256m
IntCache: cache: 0, tcache: 0, allocated: 6, tallocated: 105
FML: MCP 9.42 Powered by Forge 14.23.5.2854 Optifine OptiFine_1.12.2_HD_U_G5 120 mods loaded, 120 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 | forge-1.12.2-14.23.5.2854.jar | e3c3d50c7c986df74c645c0ac54639741c90a557 |
| LCHIJA | forge | 14.23.5.2854 | forge-1.12.2-14.23.5.2854.jar | e3c3d50c7c986df74c645c0ac54639741c90a557 |
| LCHIJA | creativecoredummy | 1.0.0 | minecraft.jar | None |
| LCHIJA | ivtoolkit | 1.3.3-1.12 | minecraft.jar | None |
| LCHIJA | micdoodlecore | | minecraft.jar | None |
| LCHIJA | xaerominimap_core | 1.12.2-1.0 | minecraft.jar | None |
| LCHIJA | com.elytradev.movingworld.common.asm.coremod | | minecraft.jar | None |
| LCHIJA | obfuscate | 0.2.6 | minecraft.jar | None |
| LCHIJA | securitycraft | v1.8.14.1 | [1.12.2]+SecurityCraft+v1.8.14.1.jar | None |
| LCHIJA | damageindicatorsmod | 1.0 | [1.12.2]DamageIndicatorsMod-3.5.1.jar | None |
| LCHIJA | alcatrazcore | 1.0.4 | alcatrazcore-1.0.4 (1).jar | 3c2d6be715971d1ed58a028cdb3fae72987fc934 |
| LCHIJA | waila | 1.8.26 | Hwyla-1.8.26-B41_1.12.2.jar | None |
| LCHIJA | wumpleutil | 2.12.9 | wumpleutil-1.12.2-2.12.9.jar | None |
| LCHIJA | foodfunk | 4.9.6 | foodfunk-1.12.2-4.9.6.jar | None |
| LCHIJA | biomesoplenty | 7.0.1.2444 | BiomesOPlenty-1.12.2-7.0.1.2444-universal.jar | None |
| LCHIJA | craftstudioapi | 1.0.0 | CraftStudio-1.0.0.93-mc1.12-alpha.jar | None |
| LCHIJA | harvestcraft | 1.12.2zb | Pam's+HarvestCraft+1.12.2zg.jar | None |
| LCHIJA | animania | 2.0.3.28 | animania-1.12.2-base-2.0.3.28.jar | None |
| LCHIJA | aquaculture | 1.6.8 | Aquaculture-1.12.2-1.6.8 (1).jar | None |
| LCHIJA | artemislib | 1.0.6 | ArtemisLib-1.12.2-v1.0.6.jar | None |
| LCHIJA | jei | 4.16.1.301 | jei_1.12.2-4.16.1.301 (1).jar | None |
| LCHIJA | betteranimals | 5.3.1 | betteranimals-1.12.2-5.3.1 (1).jar | None |
| LCHIJA | quark | r1.6-179 | Quark-r1.6-179.jar | None |
| LCHIJA | autoreglib | 1.3-32 | AutoRegLib-1.3-32.jar | None |
| LCHIJA | baubles | 1.5.2 | Baubles-1.12-1.5.2.jar | None |
| LCHIJA | bettercaves | 1.12.2 | bettercaves-1.12.2-2.0.4.jar | None |
| LCHIJA | forgelin | 1.8.3 | Forgelin-1.8.3 (1).jar | None |
| LCHIJA | betterfoliage | 2.3.1 | BetterFoliage-MC1.12-2.3.1 (2).jar | None |
| LCHIJA | bettermineshafts | 1.12.2-2.2 | BetterMineshaftsForge-1.12.2-2.2.jar | None |
| LCHIJA | betternether | 0.1.8.6 | betternether-0.1.8.6 (1).jar | None |
| LCHIJA | bibliocraft | 2.4.5 | BiblioCraft[v2.4.5][MC1.12.2].jar | None |
| LCHIJA | cdm | 0.4.1 | device-mod-0.4.1-1.12.2.jar | None |
| LCHIJA | bubble_burst | 3.1 | BubbleBurst-3.1.jar | None |
| LCHIJA | buildcraftlib | 7.99.24.8 | buildcraft-all-7.99.24.8.jar | None |
| LCHIJA | buildcraftcore | 7.99.24.8 | buildcraft-all-7.99.24.8.jar | None |
| LCHIJA | buildcraftbuilders | 7.99.24.8 | buildcraft-all-7.99.24.8.jar | None |
| LCHIJA | buildcrafttransport | 7.99.24.8 | buildcraft-all-7.99.24.8.jar | None |
| LCHIJA | buildcraftsilicon | 7.99.24.8 | buildcraft-all-7.99.24.8.jar | None |
| LCHIJA | buildcraftcompat | 7.99.24.8 | buildcraft-all-7.99.24.8.jar | None |
| LCHIJA | buildcraftenergy | 7.99.24.8 | buildcraft-all-7.99.24.8.jar | None |
| LCHIJA | buildcraftfactory | 7.99.24.8 | buildcraft-all-7.99.24.8.jar | None |
| LCHIJA | buildcraftrobotics | 7.99.24.8 | buildcraft-all-7.99.24.8.jar | None |
| LCHIJA | camera | 1.0.10 | camera-1.0.10.jar | None |
| LCHIJA | ctm | MC1.12.2-1.0.2.31 | CTM-MC1.12.2-1.0.2.31.jar | None |
| LCHIJA | chisel | MC1.12.2-1.0.2.45 | Chisel-MC1.12.2-1.0.2.45.jar | None |
| LCHIJA | chiselsandbits | 14.33 | chiselsandbits-14.33.jar | None |
| LCHIJA | chunkanimator | 1.2 | ChunkAnimator-MC1.12-1.2.jar | None |
| LCHIJA | collective | 2.9 | collective-1.12.2-2.9.jar | None |
| LCHIJA | composter | 1.9.2 | composter-1.12.2-1.9.2.jar | 1e57901a90acd4a3a54295b6decff5397be51a31 |
| LCHIJA | extendedrenderer | v1.0 | coroutil-1.12.1-1.2.37.jar | None |
| LCHIJA | coroutil | 1.12.1-1.2.37 | coroutil-1.12.1-1.2.37.jar | None |
| LCHIJA | configmod | v1.0 | coroutil-1.12.1-1.2.37.jar | None |
| LCHIJA | corpse | 1.12.2-1.0.8 | Corpse-Mod-1.12.2.jar | None |
| LCHIJA | craftablechainmail | 1.0 | craftablechainmail-1.0.jar | None |
| LCHIJA | creativecore | 1.10.0 | CreativeCore_v1.10.47_mc1.12.2.jar | None |
| LCHIJA | customspawner | 3.11.4 | CustomMobSpawner-3.11.5.jar | None |
| LCHIJA | movingworld | 1.12-6.353 | movingworld-1.12-6.353-full.jar | None |
| LCHIJA | davincisvessels | @DVESSELSVER@ | davincisvessels-1.12-6.340-full.jar | None |
| LCHIJA | ptrmodellib | 1.0.4 | PTRLib-1.0.4.jar | None |
| LCHIJA | props | 2.6.3 | Decocraft-2.6.3_1.12.2.jar | None |
| LCHIJA | doggytalents | 1.15.1.6 | DoggyTalents-1.12.2-1.15.1.6.jar | None |
| LCHIJA | galacticraftcore | 4.0.2.280 | GalacticraftCore-1.12.2-4.0.2.280.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 (1).jar | 7a2128d395ad96ceb9d9030fbd41d035b435753a |
| LCHIJA | dsurround | 3.6.1.0 | DynamicSurroundings-1.12.2-3.6.1.0 (1).jar | 7a2128d395ad96ceb9d9030fbd41d035b435753a |
| LCHIJA | reccomplex | 1.4.8.1 | RecurrentComplex-1.4.8.1.jar | None |
| LCHIJA | dynamictrees | 1.12.2-0.9.22 | DynamicTrees-1.12.2-0.9.22 (1).jar | None |
| LCHIJA | dynamictreesbop | 1.12.2-1.4.4 | DynamicTreesBOP-1.12.2-1.4.4 (1).jar | None |
| LCHIJA | enhancedvisuals | 1.3.0 | EnhancedVisuals_v1.3.24_mc1.12.2.jar | None |
| LCHIJA | exoticbirds | 1.0 | Exotic+Birds+1.12.2-3.2.0 (1).jar | None |
| LCHIJA | umm3185118519 | release 1.5 - MC 1.12.2 | Extended+ItemsOres+[1.12.2]+(release+1.5).jar | None |
| LCHIJA | galacticraftplanets | 4.0.2.280 | Galacticraft-Planets-1.12.2-4.0.2.280.jar | None |
| LCHIJA | mjrlegendslib | 1.12.2-1.2.0 | MJRLegendsLib-1.12.2-1.2.0.jar | b02331787272ec3515ebe63ecdeea0d746653468 |
| LCHIJA | extraplanets | 1.12.2-0.7.2 | ExtraPlanets-1.12.2-0.7.2.jar | b02331787272ec3515ebe63ecdeea0d746653468 |
| LCHIJA | fbp | 2.4.1 | FancyBlockParticles-1.12.x-2.4.1.jar | None |
| LCHIJA | firstaid | 1.6.15 | firstaid-1.6.15.jar | 7904c4e13947c8a616c5f39b26bdeba796500722 |
| LCHIJA | cfm | 6.3.1 | furniture-6.3.1-1.12.2.jar | None |
| LCHIJA | gulliverreborn | 1.10 | Gulliver+Reborn+mc1.12.2+v1.10.jar | None |
| LCHIJA | ichunutil | 7.2.2 | iChunUtil-1.12.2-7.2.2.jar | 4db5c2bd1b556f252a5b8b54b256d381b2a0a6b8 |
| LCHIJA | ironchest | 1.12.2-7.0.67.844 | ironchest-1.12.2-7.0.72.847.jar | None |
| LCHIJA | jaff | 1.7_for_1.12 | JustAFewFish-1.7_for_1.12.jar | None |
| LCHIJA | dogslie | 1.0.2 | LetSleepingDogsLie-1.12.2-1.0.2.jar | 4db5c2bd1b556f252a5b8b54b256d381b2a0a6b8 |
| LCHIJA | malisiscore | 1.12.2-6.5.1-SNAPSHOT | malisiscore-1.12.2-6.5.1.jar | None |
| LCHIJA | malisisdoors | 1.12.2-7.3.0 | malisisdoors-1.12.2-7.3.0.jar | None |
| LCHIJA | minemenu | 1.6.11 | MineMenu-1.12.2-1.6.11-universal.jar | None |
| LCHIJA | mobends | 1.0.0-beta-20.06.20 | MoBends_1.12.2-1.0.0-beta-20.06.20.jar | None |
| LCHIJA | modularwarfare | 0.5.1 | modularwarfare-1.5.1f (1).jar | None |
| LCHIJA | morph | 7.2.0 | Morph-1.12.2-7.2.1.jar | 4db5c2bd1b556f252a5b8b54b256d381b2a0a6b8 |
| LCHIJA | notreepunching | 2.0.21 | notreepunching-2.0.21 (1).jar | None |
| LCHIJA | nutrition | 4.6.1 | Nutrition-1.12.2-4.6.1.jar | None |
| LCHIJA | potioncore | 1.9_for_1.12.2 | PotionCore-1.9_for_1.12.2.jar | None |
| LCHIJA | qualitytools | 1.0.7_for_1.12.2 | QualityTools-1.0.7_for_1.12.2.jar | None |
| LCHIJA | railcraft | 12.0.0 | railcraft-12.0.0.jar | a0c255ac501b2749537d5824bb0f0588bf0320fa |
| LCHIJA | realdrops | 1.2.14 | RealisticItemDrops-1.2.14.jar | None |
| LCHIJA | realdropsaddon | 0.1.1 | RealisticItemDropsAddon-0.1.1.jar | None |
| LCHIJA | realistictorches | 2.1.2 | RealisticTorches-1.12.2-2.1.2.jar | None |
| LCHIJA | additionalstructures | 2.3.1 | Rex's-Additional-Structures-1.12.x-(v.2.3.1).jar | None |
| LCHIJA | roguelike | 1.8.0 | RoguelikeDungeons-1.12.2-1.8.0 (1).jar | None |
| LCHIJA | ruins | 17.2 | Ruins-1.12.2 (1).jar | None |
| LCHIJA | simpledivegear | 1.1.1 | SimpleDivingGear-1.1.1+mc+1.12.2.jar | None |
| LCHIJA | smarthud | 2.0.2 | smarthud-2.0.2.jar | None |
| LCHIJA | soundfilters | 0.12.1_for_1.12 | SoundFilters-0.12.1_for_1.12.jar | None |
| LCHIJA | spartanshields | 1.5.4 | SpartanShields-1.12.2-1.5.4.jar | None |
| LCHIJA | spartanweaponry | beta 1.3.8 | SpartanWeaponry-1.12.2-beta-1.3.8.jar | None |
| LCHIJA | stygian | 1.0.4 | stygian-1.0.4.jar | None |
| LCHIJA | toolbelt | 1.9.13 | ToolBelt-1.12.2-1.9.13.jar | None |
| LCHIJA | toughasnails | 3.1.0.139 | ToughAsNails-1.12.2-3.1.0.139-universal.jar | None |
| LCHIJA | travelersbackpack | 1.0.35 | TravelersBackpack-1.12.2-1.0.35.jar | None |
| LCHIJA | vehicle | 0.44.1 | vehicle-mod-0.44.1-1.12.2.jar | None |
| LCHIJA | villagespawnpoint | 1.5 | villagespawnpoint_1.12.2-1.5.jar | None |
| LCHIJA | weather2 | 1.12.1-2.6.12 | weather2-1.12.1-2.6.12.jar | None |
| LCHIJA | wizardanimalsbeta10 | 1.0.0 | WizardAnimalsBeta1.0 (1).jar | None |
| LCHIJA | wolfarmor | 3.7.5 | wolfarmor-1.12.2-3.7.5-universal-signed.jar | e94e38a605842477f3ec218e6fcf781f6b3f7f89 |
| LCHIJA | woolintostrings | 1.0.2 | WoolIntoStrings-1.12.2-1.0.2.jar | None |
| LCHIJA | xaerominimap | 21.4.1 | Xaeros_Minimap_21.4.1_Forge_1.12.jar | None |
| LCHIJA | betteranimalsplus | 9.0.1 | betteranimalsplus-1.12.2-9.0.1 (2).jar | None |
| LCHIJA | immersiveengineering | 0.12-98 | ImmersiveEngineering-0.12-98.jar | None |
| LCHIJA | mineralogy | 3.8.0 | Mineralogy-1.12.2-3.8.0.53.jar | d476d1b22b218a10d845928d1665d45fce301b27 |
Loaded coremods (and transformers):
IELoadingPlugin (ImmersiveEngineering-core-0.12-98.jar)
blusunrize.immersiveengineering.common.asm.IEClassTransformer
SSLoadingPlugin (SereneSeasons-1.12.2-1.2.18-universal.jar)
sereneseasons.asm.transformer.EntityRendererTransformer
sereneseasons.asm.transformer.WorldTransformer
TransformLoader (DynamicSurroundings-1.12.2-3.6.1.0 (1).jar)
MovingWorldCore (movingworld-1.12-6.353-full.jar)
MicdoodlePlugin (MicdoodleCore-1.12.2-4.0.2.280.jar)
micdoodle8.mods.miccore.MicdoodleTransformer
BetterFoliageLoader (BetterFoliage-MC1.12-2.3.1 (2).jar)
mods.betterfoliage.loader.BetterFoliageTransformer
ObfuscatePlugin (obfuscate-0.2.6-1.12.2.jar)
com.mrcrayfish.obfuscate.asm.ObfuscateTransformer
Quark Plugin (Quark-r1.6-179.jar)
vazkii.quark.base.asm.ClassTransformer
CTMCorePlugin (CTM-MC1.12.2-1.0.2.31.jar)
team.chisel.ctm.client.asm.CTMTransformer
ForgelinPlugin (Forgelin-1.8.3 (1).jar)
WolfArmorCore (wolfarmor-1.12.2-3.7.5-universal-signed.jar)
Real item drops plugin (RealisticItemDropsAddon-0.1.1.jar)
me.russoul.realdropsaddon.asm.ClassTransformer
XaeroMinimapPlugin (Xaeros_Minimap_21.4.1_Forge_1.12.jar)
xaero.common.core.transformer.ChunkTransformer
xaero.common.core.transformer.NetHandlerPlayClientTransformer
xaero.common.core.transformer.EntityPlayerTransformer
xaero.common.core.transformer.AbstractClientPlayerTransformer
xaero.common.core.transformer.WorldClientTransformer
xaero.common.core.transformer.EntityPlayerSPTransformer
xaero.common.core.transformer.PlayerListTransformer
xaero.common.core.transformer.GuiIngameForgeTransformer
xaero.common.core.transformer.GuiBossOverlayTransformer
MalisisCorePlugin (malisiscore-1.12.2-6.5.1.jar)
CreativePatchingLoader (CreativeCore_v1.10.47_mc1.12.2.jar)
IvToolkit (IvToolkit-1.3.3-1.12.jar)
LoadingPlugin (ChunkAnimator-MC1.12-1.2.jar)
lumien.chunkanimator.asm.ClassTransformer
GL info: ~~ERROR~~ RuntimeException: No OpenGL context found in the current thread.
No Tree Punching: You are not running an official build. This version will NOT be supported by the author.
Profiler Position: N/A (disabled)
Player Count: 1 / 8; [GCEntityPlayerMP['Jellobro22'/3566, l='my solo run', x=-427.60, y=64.00, z=802.72]]
Type: Integrated Server (map_client.txt)
Is Modded: Definitely; Client brand changed to 'fml,forge'
OptiFine Version: OptiFine_1.12.2_HD_U_G5
OptiFine Build: 20210124-142939
Render Distance Chunks: 12
Mipmaps: 4
Anisotropic Filtering: 1
Antialiasing: 0
Multitexture: false
Shaders: null
OpenGlVersion: 4.6.14757 Compatibility Profile Context 20.12.1 27.20.14501.28009
OpenGlRenderer: Radeon RX 570 Series
OpenGlVendor: ATI Technologies Inc.
CpuCount: 8
