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I don't fully know if this will work, but try taking out Optifine. I hope that helps!
Maybe its just a glitch
// Would you like a cupcake? Time: 6/26/15 8:25 PM
Description: Exception in server tick loop java.util.ConcurrentModificationException
at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:901)
at java.util.ArrayList$Itr.next(ArrayList.java:851)
at scala.collection.convert.Wrappers$JIteratorWrapper.next(Wrappers.scala:43)
at scala.collection.Iterator$class.foreach(Iterator.scala:743)
at scala.collection.AbstractIterator.foreach(Iterator.scala:1174)
at scala.collection.IterableLike$class.foreach(IterableLike.scala:72)
at scala.collection.AbstractIterable.foreach(Iterable.scala:54)
at mrtjp.core.world.BlockUpdateHandler$.onTick(blocktickhook.scala:46)
at cpw.mods.fml.common.eventhandler.ASMEventHandler_976_BlockUpdateHandler$_onTick_WorldTickEvent.invoke(.dynamic)
at cpw.mods.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:54)
at cpw.mods.fml.common.eventhandler.EventBus.post(EventBus.java:138)
at cpw.mods.fml.common.FMLCommonHandler.onPostWorldTick(FMLCommonHandler.java:255)
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:645)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:547)
at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:186)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:427)
at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:685) A detailed walkthrough of the error, its code path and all known details is as follows:
--------------------------------------------------------------------------------------- -- System Details --
Details:
Minecraft Version: 1.7.10
Operating System: Windows 8.1 (amd64) version 6.3
Java Version: 1.8.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 1299602984 bytes (1239 MB) / 2134114304 bytes (2035 MB) up to 3706978304 bytes (3535 MB)
JVM Flags: 7 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx3548M -Xms2048M -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
IntCache: cache: 0, tcache: 0, allocated: 15, tallocated: 96
FML: MCP v9.05 FML v7.10.99.99 Minecraft Forge 10.13.4.1448 Optifine OptiFine_1.7.10_HD_U_B6 115 mods loaded, 115 mods active
States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored
UCHIJAAAAAA mcp{9.05} [Minecraft Coder Pack] (minecraft.jar)
UCHIJAAAAAA FML{7.10.99.99} [Forge Mod Loader] (forge-1.7.10-10.13.4.1448-1.7.10.jar)
UCHIJAAAAAA Forge{10.13.4.1448} [Minecraft Forge] (forge-1.7.10-10.13.4.1448-1.7.10.jar)
UCHIJAAAAAA appliedenergistics2-core{rv2-stable-9} [AppliedEnergistics2 Core] (minecraft.jar)
UCHIJAAAAAA Aroma1997Core{1.0.2.13} [Aroma1997Core] (Aroma1997Core-1.7.10-1.0.2.13.jar)
UCHIJAAAAAA CodeChickenCore{1.0.6.43} [CodeChicken Core] (minecraft.jar)
UCHIJAAAAAA Micdoodlecore{} [Micdoodle8 Core] (minecraft.jar)
UCHIJAAAAAA NotEnoughItems{1.0.4.107} [Not Enough Items] (NotEnoughItems-1.7.10-1.0.4.107-universal.jar)
UCHIJAAAAAA OpenEye{0.6} [OpenEye] (OpenEye-0.6-1.7.10.jar)
UCHIJAAAAAA VeinMiner_coremod{0.27.1_build.unknown} [Core mod] (minecraft.jar)
UCHIJAAAAAA <CoFH ASM>{000} [CoFH ASM] (minecraft.jar)
UCHIJAAAAAA mod_ThreadedLighting{1.7.10-1.0} [Threaded Lighting] (minecraft.jar)
UCHIJAAAAAA sapmanpack{2.5.1} [SanAndreasPs Manager Pack CORE edition] (SAPManPack-1.7.10-2.5.1.jar)
UCHIJAAAAAA gilded-games-util{1.7.10-1.1} [Gilded Games Utility] (gilded-games-util.jar)
UCHIJAAAAAA battlegear2{1.7.10} [Mine & Blade Battlegear 2 - Bullseye] (1.7.10-MB_Battlegear2-Bullseye-1.0.8.0.jar)
UCHIJAAAAAA lucky{5.1.0} [Lucky Block] ([1-7-X]_Lucky_Block_v5-1-0.jar)
UCHIJAAAAAA bspkrsCore{6.15} [bspkrsCore] ([1.7.10]bspkrsCore-universal-6.15.jar)
UCHIJAAAAAA ArmorStatusHUD{1.28} [ArmorStatusHUD] ([1.7.10]ArmorStatusHUD-client-1.28.jar)
UCHIJAAAAAA CraftableAnimals{2.4.3.0} [Craftable Animals] ([1.7.10]CraftableAnimals v2.4.3.0.jar)
UCHIJAAAAAA DamageIndicatorsMod{3.2.3} [Damage Indicators] ([1.7.10]DamageIndicatorsMod-3.2.3.jar)
UCHIJAAAAAA nevermine{2.0.1} [AdventOfAscension] (AoA-2.2.5-Departed.jar)
UCHIJAAAAAA AppleCore{1.1.0} [AppleCore] (AppleCore-mc1.7.10-1.1.0.jar)
UCHIJAAAAAA appliedenergistics2{rv2-stable-9} [Applied Energistics 2] (appliedenergistics2-rv2-stable-9.jar)
UCHIJAAAAAA Aroma1997CoreHelper{1.0.2.13} [Aroma1997Core|Helper] (Aroma1997Core-1.7.10-1.0.2.13.jar)
UCHIJAAAAAA AromaBackup{0.0.0.5} [AromaBackup] (AromaBackup-1.7.10-0.0.0.5.jar)
UCHIJAAAAAA Artifacts{1.1.1} [Artifacts] (Artifacts-1.1.1.jar)
UCHIJAAAAAA BattleTowers{1.4.9} [Battle Towers] (BattleTowers-1.7.10.jar)
UCHIJAAAAAA BiomesOPlenty{2.1.0} [Biomes O' Plenty] (BiomesOPlenty-1.7.10-2.1.0.1067-universal.jar)
UCHIJAAAAAA AWWayofTime{v1.3.3} [Blood Magic: Alchemical Wizardry] (BloodMagic-1.7.10-1.3.3-4.jar)
UCHIJAAAAAA CoFHCore{1.7.10R3.0.2} [CoFH Core] (CoFHCore-[1.7.10]3.0.2-262 (1).jar)
UCHIJAAAAAA BuildCraft|Core{7.0.12} [BuildCraft] (buildcraft-7.0.12.jar)
UCHIJAAAAAA BuildCraft|Energy{7.0.12} [BC Energy] (buildcraft-7.0.12.jar)
UCHIJAAAAAA BuildCraft|Factory{7.0.12} [BC Factory] (buildcraft-7.0.12.jar)
UCHIJAAAAAA BuildCraft|Transport{7.0.12} [BC Transport] (buildcraft-7.0.12.jar)
UCHIJAAAAAA BuildCraft|Builders{7.0.12} [BC Builders] (buildcraft-7.0.12.jar)
UCHIJAAAAAA BuildCraft|Silicon{7.0.12} [BC Silicon] (buildcraft-7.0.12.jar)
UCHIJAAAAAA BuildCraft|Robotics{7.0.12} [BC Robotics] (buildcraft-7.0.12.jar)
UCHIJAAAAAA BuildCraft|Compat{7.0.8} [BuildCraft Compat] (buildcraft-compat-7.0.8.jar)
UCHIJAAAAAA CarpentersBlocks{3.3.6} [Carpenter's Blocks] (Carpenter's Blocks v3.3.6 - MC 1.7.10.jar)
UCHIJAAAAAA ChickenChunks{1.3.4.19} [ChickenChunks] (ChickenChunks-1.7.10-1.3.4.19-universal.jar)
UCHIJAAAAAA claysoldiers{2.0.0-beta.2} [Clay Soldiers Mod] (ClaySoldiersMod-1.7.10-2.0.0-beta.2.jar)
UCHIJAAAAAA CustomOreGen{1.2.13} [Custom Ore Generation] (CustomOreGen-1.7.10-1.2.13.jar)
UCHIJAAAAAA dungeonpack{1.7.10-1.0} [Dungeon Pack] (dungeonpack-1.7.10-1.0.jar)
UCHIJAAAAAA Mantle{1.7.10-0.3.2.jenkins184} [Mantle] (Mantle-1.7.10-0.3.2.jar)
UCHIJAAAAAA ThermalFoundation{1.7.10R1.0.0} [Thermal Foundation] (ThermalFoundation-[1.7.10]1.0.0-81.jar)
UCHIJAAAAAA ThermalExpansion{1.7.10R4.0.1} [Thermal Expansion] (ThermalExpansion-[1.7.10]4.0.1-182.jar)
UCHIJAAAAAA Waila{1.5.10} [Waila] (Waila-1.5.10_1.7.10.jar)
UCHIJAAAAAA TConstruct{1.7.10-1.8.5.build957} [Tinkers' Construct] (TConstruct-1.7.10-1.8.5.jar)
UCHIJAAAAAA ForgeMultipart{1.2.0.344} [Forge Multipart] (ForgeMultipart-1.7.10-1.2.0.344-universal.jar)
UCHIJAAAAAA ExtraUtilities{1.2.6} [Extra Utilities] (extrautilities-1.2.6.jar)
UCHIJAAAAAA MetallurgyCore{4.0.4} [Metallurgy Core] (MetallurgyCore-1.7.10-4.0.4.18.jar)
UCHIJAAAAAA Metallurgy{4.0.6} [Metallurgy 4] (Metallurgy-1.7.10-4.0.6.80.jar)
UCHIJAAAAAA progressiveautomation{1.6.18} [Progressive Automation] (ProgressiveAutomation-1.7.10-1.6.18.jar)
UCHIJAAAAAA ExtraTiC{1.4.5} [ExtraTiC] (ExtraTiC-1.7.10-1.4.5.jar)
UCHIJAAAAAA FastCraft{1.21} [FastCraft] (fastcraft-1.21.jar)
UCHIJAAAAAA fastleafdecay{1.0} [Fast Leaf Decay] (FastLeafDecay-1.7.10-1.0.jar)
UCHIJAAAAAA Steamcraft{0.28.7} [Flaxbeard's Steam Power] (Flaxbeard'sSteamPower-1.7.10-0.28.7.jar)
UCHIJAAAAAA GalacticraftCore{3.0.12} [Galacticraft Core] (GalacticraftCore-1.7-3.0.12.345.jar)
UCHIJAAAAAA GalacticraftMars{3.0.12} [Galacticraft Planets] (Galacticraft-Planets-1.7-3.0.12.345.jar)
UCHIJAAAAAA ganyssurface{1.11.1} [Gany's Surface] (Ganys Surface-1.11.1.jar)
UCHIJAAAAAA HardcoreEnderExpansion{1.8.1} [Hardcore Ender Expansion] (HardcoreEnderExpansion MC-1.7.10 v1.8.1.jar)
UCHIJAAAAAA iChunUtil{4.2.2} [iChunUtil] (iChunUtil-4.2.2.jar)
UCHIJAAAAAA Hats{4.0.1} [Hats] (Hats-4.0.1.jar)
UCHIJAAAAAA headcrumbs{1.5.4} [Headcrumbs] (Headcrumbs-1.5.4.jar)
UCHIJAAAAAA ironbackpacks{0.5.0} [Iron Backpacks] (Iron Backpacks-1.7.10-1.0.4-universal.jar)
UCHIJAAAAAA IronChest{6.0.62.742} [Iron Chest] (ironchest-1.7.10-6.0.62.742-universal.jar)
UCHIJAAAAAA journeymap{5.0.1} [JourneyMap] (JourneyMap5.0.1_Unlimited_MC1.7.10.jar)
UCHIJAAAAAA lootbags{1.8.1} [Loot Bags] (LootBags-1.7.10-1.8.1.jar)
UCHIJAAAAAA lycanitesmobs{1.10.0c - MC 1.7.10} [Lycanites Mobs] (LycanitesMobsComplete 1.10.0c [1.7.10].jar)
UCHIJAAAAAA arcticmobs{1.10.0c - MC 1.7.10} [Lycanites Arctic Mobs] (LycanitesMobsComplete 1.10.0c [1.7.10].jar)
UCHIJAAAAAA demonmobs{1.10.0c - MC 1.7.10} [Lycanites Demon Mobs] (LycanitesMobsComplete 1.10.0c [1.7.10].jar)
UCHIJAAAAAA desertmobs{1.10.0c - MC 1.7.10} [Lycanites Desert Mobs] (LycanitesMobsComplete 1.10.0c [1.7.10].jar)
UCHIJAAAAAA forestmobs{1.10.0c - MC 1.7.10} [Lycanites Forest Mobs] (LycanitesMobsComplete 1.10.0c [1.7.10].jar)
UCHIJAAAAAA freshwatermobs{1.10.0c - MC 1.7.10} [Lycanites Freshwater Mobs] (LycanitesMobsComplete 1.10.0c [1.7.10].jar)
UCHIJAAAAAA infernomobs{1.10.0c - MC 1.7.10} [Lycanites Inferno Mobs] (LycanitesMobsComplete 1.10.0c [1.7.10].jar)
UCHIJAAAAAA junglemobs{1.10.0c - MC 1.7.10} [Lycanites Jungle Mobs] (LycanitesMobsComplete 1.10.0c [1.7.10].jar)
UCHIJAAAAAA mountainmobs{1.10.0c - MC 1.7.10} [Lycanites Mountain Mobs] (LycanitesMobsComplete 1.10.0c [1.7.10].jar)
UCHIJAAAAAA plainsmobs{1.10.0c - MC 1.7.10} [Lycanites Plains Mobs] (LycanitesMobsComplete 1.10.0c [1.7.10].jar)
UCHIJAAAAAA saltwatermobs{1.10.0c - MC 1.7.10} [Lycanites Saltwater Mobs] (LycanitesMobsComplete 1.10.0c [1.7.10].jar)
UCHIJAAAAAA swampmobs{1.10.0c - MC 1.7.10} [Lycanites Swamp Mobs] (LycanitesMobsComplete 1.10.0c [1.7.10].jar)
UCHIJAAAAAA RadixCore{2.0.2} [RadixCore] (RadixCore-2.0.2-1.7.10-universal.jar)
UCHIJAAAAAA MCA{5.0.6} [Minecraft Comes Alive] (MCA-5.0.6-1.7.10-universal.jar)
UCHIJAAAAAA MineTweaker3{3.0.9B} [MineTweaker 3] (MineTweaker3-1.7.10-3.0.9C.jar)
UCHIJAAAAAA MoarSigns{1.1.4} [MoarSigns] (MoarSigns-1.7.10-1.1.4.jar)
UCHIJAAAAAA MobAmputation{4.0.1} [MobAmputation] (MobAmputation-4.0.1.jar)
UCHIJAAAAAA MobDismemberment{4.0.0} [MobDismemberment] (MobDismemberment-4.0.0.jar)
UCHIJAAAAAA modtweaker2{0.8.3} [Mod Tweaker 2] (ModTweaker~2-0.8.3.jar)
UCHIJAAAAAA Morph{0.9.1} [Morph] (Morph-Beta-0.9.1.jar)
UCHIJAAAAAA cfm{3.4.7} [ยง9MrCrayfish's Furniture Mod] (MrCrayfishFurnitureModv3.4.7(1.7.10).jar)
UCHIJAAAAAA NetherOres{1.7.10R2.3.1B1} [Nether Ores] (NetherOres-[1.7.10]2.3.1B1-14.jar)
UCHIJAAAAAA recipehandler{0.2} [NoMoreRecipeConflict] (NoMoreRecipeConflict-0.2(1.7.10).jar)
UCHIJAAAAAA primitivemobs{1.0} [Primitive Mobs] (primitivemobs-1.0c-1.7.10.jar)
UCHIJAAAAAA MrTJPCoreMod{1.0.9.19} [MrTJPCore] (MrTJPCore-1.7.10-1.0.9.19-universal.jar)
UCHIJAAAAAA ProjRed|Core{4.7.0pre2.87} [ProjectRed] (ProjectRed-1.7.10-4.7.0pre2.87-Base.jar)
UCHIJAAAAAA ProjRed|Transmission{4.7.0pre2.87} [ProjectRed-Transmission] (ProjectRed-1.7.10-4.7.0pre2.87-Integration.jar)
UCHIJAAAAAA ProjRed|Exploration{4.7.0pre2.87} [ProjectRed-Exploration] (ProjectRed-1.7.10-4.7.0pre2.87-World.jar)
UCHIJAAAAAA ProjRed|Compatibility{4.7.0pre2.87} [ProjectRed-Compatibility] (ProjectRed-1.7.10-4.7.0pre2.87-Compat.jar)
UCHIJAAAAAA ProjRed|Integration{4.7.0pre2.87} [ProjectRed-Integration] (ProjectRed-1.7.10-4.7.0pre2.87-Integration.jar)
UCHIJAAAAAA ProjRed|Illumination{4.7.0pre2.87} [ProjectRed-Illumination] (ProjectRed-1.7.10-4.7.0pre2.87-Lighting.jar)
UCHIJAAAAAA Railcraft{9.6.1.0} [Railcraft] (Railcraft_1.7.10-9.6.1.0.jar)
UCHIJAAAAAA RedstoneArsenal{1.7.10R1.1.0} [Redstone Arsenal] (RedstoneArsenal-[1.7.10]1.1.0-80.jar)
UCHIJAAAAAA SpecialMobs{3.1.1} [Special Mobs] (SpecialMobs-1.7.10-3.1.1.jar)
UCHIJAAAAAA StevesCarts{2.0.0.b18} [Steve's Carts 2] (StevesCarts2.0.0.b18.jar)
UCHIJAAAAAA ThermalDynamics{1.7.10R1.0.0} [Thermal Dynamics] (ThermalDynamics-[1.7.10]1.0.0-122.jar)
UCHIJAAAAAA TiCTooltips{1.2.4} [TiC Tooltips] (TiCTooltips-mc1.7.10-1.2.4.jar)
UCHIJAAAAAA TooMuchTNT{2.9} [TooMuchTNT] (TooMuchTNT v2.9.jar)
UCHIJAAAAAA TwilightForest{2.3.7} [The Twilight Forest] (twilightforest-1.7.10-2.3.7.jar)
UCHIJAAAAAA UtilityMobs{3.1.1} [Utility Mobs] (UtilityMobs-1.7.10-3.1.1.jar)
UCHIJAAAAAA VeinMiner{0.27.1_build.unknown} [Vein Miner] (VeinMiner-1.7.10_0.27.1.unknown.jar)
UCHIJAAAAAA VeinMinerModSupport{0.27.1_build.unknown} [Mod Support] (VeinMiner-1.7.10_0.27.1.unknown.jar)
UCHIJAAAAAA wawla{1.3.0} [What Are We Looking At] (Wawla-1.3.0-1.7.10.jar)
UCHIJAAAAAA McMultipart{1.2.0.344} [Minecraft Multipart Plugin] (ForgeMultipart-1.7.10-1.2.0.344-universal.jar)
UCHIJAAAAAA HungerOverhaul{1.7.10-1.0.0.jenkins75} [Hunger Overhaul] (HungerOverhaul-1.7.10-1.0.0.jar)
UCHIJAAAAAA IguanaTweaksTConstruct{1.7.10-2.1.5.140} [Iguana Tinker Tweaks] (IguanaTinkerTweaks-1.7.10-2.1.5.jar)
UCHIJAAAAAA ForgeMicroblock{1.2.0.344} [Forge Microblocks] (ForgeMultipart-1.7.10-1.2.0.344-universal.jar)
AE2 Version: stable rv2-stable-9 for Forge 10.13.2.1291
CoFHCore: -[1.7.10]3.0.2-262
Mantle Environment: DO NOT REPORT THIS CRASH! Unsupported mods in environment: optifine
ThermalFoundation: -[1.7.10]1.0.0-81
ThermalExpansion: -[1.7.10]4.0.1-182
TConstruct Environment: Environment healthy.
NetherOres: -[1.7.10]2.3.1B1-14
RedstoneArsenal: -[1.7.10]1.1.0-80
ThermalDynamics: -[1.7.10]1.0.0-122
AE2 Integration: IC2:OFF, RotaryCraft:OFF, RC:ON, BC:ON, RF:ON, RFItem:ON, MFR:OFF, DSU:ON, FZ:OFF, FMP:ON, RB:OFF, CLApi:OFF, Waila:ON, InvTweaks:OFF, NEI:ON, CraftGuide:OFF, Mekanism:OFF, ImmibisMicroblocks:OFF, BetterStorage:OFF
Profiler Position: N/A (disabled)
Vec3 Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Player Count: 1 / 8; [GCEntityPlayerMP['MinecraftBUFFALO'/381, l='PAIN is GUD mlg XX pro', x=914.50, y=64.00, z=448.50]]
Type: Integrated Server (map_client.txt)
Is Modded: Definitely; Client brand changed to 'fml,forge'
I don't fully know if this will work, but try taking out Optifine. I hope that helps!
Maybe its just a glitch