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why does this happen:

---- Minecraft Crash Report ----
// I'm sorry, Dave.

Time: 5/28/16 12:55 PM
Description: Exception in server tick loop

java.lang.IllegalArgumentException: bound must be positive
at java.util.Random.nextInt(Random.java:388)
at net.minecraft.world.SpawnerAnimals.func_77191_a(SpawnerAnimals.java:339)
at net.minecraft.world.gen.ChunkProviderGenerate.func_73153_a(ChunkProviderGenerate.java:424)
at net.minecraft.world.gen.ChunkProviderServer.func_73153_a(ChunkProviderServer.java:279)
at fastcraft.a.d.a(F:84)
at fastcraft.Hooks.r(F:137)
at net.minecraft.world.chunk.Chunk.func_76624_a(Chunk.java:1055)
at net.minecraft.world.gen.ChunkProviderServer.originalLoadChunk(ChunkProviderServer.java:190)
at net.minecraft.world.gen.ChunkProviderServer.loadChunk(ChunkProviderServer.java:131)
at net.minecraft.world.gen.ChunkProviderServer.func_73158_c(ChunkProviderServer.java:101)
at net.minecraft.server.MinecraftServer.func_71222_d(MinecraftServer.java:265)
at net.minecraft.server.integrated.IntegratedServer.func_71247_a(IntegratedServer.java:130)
at net.minecraft.server.integrated.IntegratedServer.func_71197_b(IntegratedServer.java:153)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:387)
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 7 (amd64) version 6.1
Java Version: 1.8.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 608955256 bytes (580 MB) / 1095155712 bytes (1044 MB) up to 4281597952 bytes (4083 MB)
Mod Pack: Unknown / None
LiteLoader Mods: 2 loaded mod(s)
- VoxelMap version 1.5.16
- VoxelLib version 2.3.1
LaunchWrapper: 57 active transformer(s)
- Transformer: cpw.mods.fml.common.asm.transformers.PatchingTransformer
- Transformer: optifine.OptiFineClassTransformer
- Transformer: cpw.mods.fml.common.asm.transformers.MarkerTransformer
- Transformer: cpw.mods.fml.common.asm.transformers.SideTransformer
- Transformer: cpw.mods.fml.common.asm.transformers.EventSubscriptionTransformer
- Transformer: net.minecraftforge.classloading.FluidIdTransformer
- Transformer: invtweaks.forge.asm.ContainerTransformer
- Transformer: codechicken.lib.asm.ClassHeirachyManager
- Transformer: codechicken.core.asm.InterfaceDependancyTransformer
- Transformer: codechicken.core.asm.TweakTransformer
- Transformer: codechicken.core.asm.DelegatedTransformer
- Transformer: codechicken.core.asm.DefaultImplementationTransformer
- Transformer: atomicstryker.dynamiclights.common.DLTransformer
- Transformer: fastcraft.asm.FastCraftTransformer
- Transformer: codechicken.nei.asm.NEITransformer
- Transformer: com.mumfrey.liteloader.transformers.event.EventProxyTransformer
- Transformer: com.mumfrey.liteloader.launch.LiteLoaderTransformer
- Transformer: com.mumfrey.liteloader.client.transformers.CrashReportTransformer
- Transformer: me.guichaguri.betterfps.transformers.MathTransformer
- Transformer: me.guichaguri.betterfps.transformers.EventTransformer
- Transformer: cpw.mods.fml.common.asm.transformers.DeobfuscationTransformer
- Transformer: cpw.mods.fml.common.asm.transformers.AccessTransformer
- Transformer: net.minecraftforge.transformers.ForgeAccessTransformer
- Transformer: mods.battlegear2.coremod.transformers.BattlegearAccessTransformer
- Transformer: invtweaks.forge.asm.ITAccessTransformer
- Transformer: aroma1997.core.coremod.asm.AromaAccessTransformer
- Transformer: codechicken.core.asm.CodeChickenAccessTransformer
- Transformer: net.malisis.core.asm.MalisisCoreAccessTransformer
- Transformer: cpw.mods.fml.common.asm.transformers.ModAccessTransformer
- Transformer: cpw.mods.fml.common.asm.transformers.ItemStackTransformer
- Transformer: net.malisis.core.util.chunkcollision.ChunkCollisionTransformer
- Transformer: net.malisis.core.util.chunkblock.ChunkBlockTransformer
- Transformer: de.sanandrew.core.manpack.transformer.TransformBadPotionsATN
- Transformer: de.sanandrew.core.manpack.transformer.TransformEntityThrowable
- Transformer: de.sanandrew.core.manpack.transformer.TransformELBAttackingPlayer
- Transformer: de.sanandrew.core.manpack.transformer.TransformPlayerDismountCtrl
- Transformer: de.sanandrew.core.manpack.transformer.TransformHorseArmor
- Transformer: de.sanandrew.core.manpack.transformer.TransformEnderman
- Transformer: mods.battlegear2.coremod.transformers.EntityPlayerTransformer
- Transformer: mods.battlegear2.coremod.transformers.ModelBipedTransformer
- Transformer: mods.battlegear2.coremod.transformers.NetClientHandlerTransformer
- Transformer: mods.battlegear2.coremod.transformers.NetServerHandlerTransformer
- Transformer: mods.battlegear2.coremod.transformers.PlayerControllerMPTransformer
- Transformer: mods.battlegear2.coremod.transformers.ItemRendererTransformer
- Transformer: mods.battlegear2.coremod.transformers.MinecraftTransformer
- Transformer: mods.battlegear2.coremod.transformers.ItemStackTransformer
- Transformer: mods.battlegear2.coremod.transformers.ItemInWorldTransformer
- Transformer: mods.battlegear2.coremod.transformers.EntityAIControlledByPlayerTransformer
- Transformer: mods.battlegear2.coremod.transformers.EntityOtherPlayerMPTransformer
- Transformer: alexiil.mods.load.coremod.BetterLoadingScreenTransformer
- Transformer: cpw.mods.fml.common.asm.transformers.TerminalTransformer
- Transformer: com.thevoxelbox.common.TimeUpdateTransformer
- Transformer: com.mumfrey.liteloader.client.transformers.LiteLoaderEventInjectionTransformer
- Transformer: com.mumfrey.liteloader.client.transformers.MinecraftOverlayTransformer
- Transformer: com.mumfrey.liteloader.common.transformers.LiteLoaderPacketTransformer
- Transformer: com.thevoxelbox.voxelmap.litemod.VoxelMapTransformer
- Transformer: cpw.mods.fml.common.asm.transformers.ModAPITransformer
JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx4G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
IntCache: cache: 12, tcache: 94, allocated: 0, tallocated: 0
FML: MCP v9.05 FML v7.10.99.99 Minecraft Forge 10.13.4.1558 Optifine OptiFine_1.7.10_HD_U_D3 90 mods loaded, 90 mods active
States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored
UCHIJAA mcp{9.05} [Minecraft Coder Pack] (minecraft.jar)
UCHIJAA FML{7.10.99.99} [Forge Mod Loader] (forge-1.7.10-10.13.4.1558-1.7.10.jar)
UCHIJAA Forge{10.13.4.1558} [Minecraft Forge] (forge-1.7.10-10.13.4.1558-1.7.10.jar)
UCHIJAA Aroma1997Core{1.0.2.16} [Aroma1997Core] (Aroma1997Core-1.7.10-1.0.2.16.jar)
UCHIJAA CodeChickenCore{1.0.7.47} [CodeChicken Core] (minecraft.jar)
UCHIJAA NotEnoughItems{1.0.5.120} [Not Enough Items] (NotEnoughItems-1.7.10-1.0.5.120-universal.jar)
UCHIJAA sapmanpack{2.4.0} [SanAndreasPs Manager Pack CORE edition] (SAPManPack-1.7.10-2.4.0.jar)
UCHIJAA battlegear2{1.7.10} [Mine & Blade Battlegear 2 - Bullseye] (1.7.10-MB_Battlegear2-Bullseye-1.0.8.3.jar)
UCHIJAA divinerpg{1.4.1.3} [DivineRPG] ([1.7.10][SMP]DivineRPG-1.4.1.3.jar)
UCHIJAA DamageIndicatorsMod{3.2.3} [Damage Indicators] ([1.7.10]DamageIndicatorsMod-3.2.3-client.jar)
UCHIJAA bspkrsCore{6.15} [bspkrsCore] ([1.7.10]bspkrsCore-universal-6.15.jar)
UCHIJAA Treecapitator{1.7.10} [Treecapitator] ([1.7.10]Treecapitator-universal-2.0.4.jar)
UCHIJAA deconstruction{2.2.5} [The Deconstruction Mod] ([MC1.7.10]deconstruction[v2.2.5].jar)
UCHIJAA inventorytweaks{1.58-147-645ca10} [Inventory Tweaks] (_Inventory-Tweaks-Mod-1.7.10.jar)
UCHIJAA animatedplayer{1.5.1} [Animated Player Mod] (AnimatedPlayer-1.7.10-1.5.1.jar)
UCHIJAA AnimationAPI{1.2.4} [AnimationAPI] (AnimationAPI-1.7.10-1.2.4.jar)
UCHIJAA nevermine{2.3} [AdventOfAscension] (AoA-2.4.B.jar)
UCHIJAA gibby_dungeons{1.4} [Arcana RPG] (Arcana RPG 1.7.10-1.4.1.jar)
UCHIJAA Aroma1997CoreHelper{1.0.2.16} [Aroma1997Core|Helper] (Aroma1997Core-1.7.10-1.0.2.16.jar)
UCHIJAA Aroma1997sDimension{1.0} [Aroma1997's Dimensional World] (Aroma1997s-Dimensional-World-1.7.10-1.1.0.1.jar)
UCHIJAA iChunUtil{4.2.2} [iChunUtil] (iChunUtil-4.2.2.jar)
UCHIJAA BackTools{4.0.0} [BackTools] (Back-Tools-Mod-1.7.10.jar)
UCHIJAA Backpack{2.0.1} [Backpack] (backpack-2.0.1-1.7.x.jar)
UCHIJAA bettermining{0.1} [Better Mining] (Better-Mining-1.1.jar)
UCHIJAA betterloadingscreen{1.3.9} [Better Loading Screen] (BetterLoadingScreen-1.3.9.jar)
UCHIJAA chocolateQuest{1.0} [Chocolate Quest] (chocolateQuest-1.7.10-1.1d.jar)
UCHIJAA claysoldiers{2.0.0-beta.2} [Clay Soldiers Mod] (ClaySoldiersMod-1.7.10-2.0.0-beta.2.jar)
UCHIJAA Creeperland{Forge 1.7.10} [Creeperland] (Creeper-Dimension-Mod-1.7.10.zip)
UCHIJAA defaultworldgenerator{0.1-b13} [Default World Generator] (DefaultWorldGenerator-1.7.10-0.1-b13-client.jar)
UCHIJAA DynamicLights{1.3.5} [Dynamic Lights] (DynamicLights-1.7.10.jar)
UCHIJAA DynamicLights_onFire{1.0.4} [Dynamic Lights Burning Entity Module] (DynamicLights-1.7.10.jar)
UCHIJAA DynamicLights_creepers{1.0.4} [Dynamic Lights Creeper Module] (DynamicLights-1.7.10.jar)
UCHIJAA DynamicLights_dropItems{1.0.7} [Dynamic Lights EntityItem Module] (DynamicLights-1.7.10.jar)
UCHIJAA DynamicLights_entityClasses{1.0.1} [Dynamic Lights Entity Light Module] (DynamicLights-1.7.10.jar)
UCHIJAA DynamicLights_mobEquipment{1.0.5} [Dynamic Lights Mob Equipment Light Module] (DynamicLights-1.7.10.jar)
UCHIJAA DynamicLights_flameArrows{1.0.0} [Dynamic Lights Fiery Arrows Light Module] (DynamicLights-1.7.10.jar)
UCHIJAA DynamicLights_floodLights{1.0.1} [Dynamic Lights Flood Light] (DynamicLights-1.7.10.jar)
UCHIJAA DynamicLights_otherPlayers{1.0.7} [Dynamic Lights OtherPlayers Light Module] (DynamicLights-1.7.10.jar)
UCHIJAA DynamicLights_thePlayer{1.1.3} [Dynamic Lights Player Light Module] (DynamicLights-1.7.10.jar)
UCHIJAA easter{1.0.0} [Easter Mod] (easter - 1.0.0(1.7.10).jar)
UCHIJAA emeraldarmor{1.0.0} [Emerald Armor] (emeraldarmor-1.7.10-(1.0.1).jar)
UCHIJAA endercompass{1.2} [Ender Compass] (EnderCompass-1.7.10-1.2.jar)
UCHIJAA eotg{1.7} [Essence Of The Gods] (Essence-Of-The-Gods-Mod-1.7.10.jar)
UCHIJAA FastCraft{1.21} [FastCraft] (fastcraft-1.21.jar)
UCHIJAA FNAFMod{1.2} [FNAFMod] (Five-Nights-at-Freddys-Mod-1.7.10.zip)
UCHIJAA godzillamod{1.6.6} [Godzilla Mod] (Godzilla Mod-1.7.10-1.6.6.jar)
UCHIJAA GraviGun{4.0.0-beta} [GraviGun] (Gravity-Gun-Mod-1.7.10.jar)
UCHIJAA headcrumbs{1.7.4} [Headcrumbs] (Headcrumbs-1.7.4.jar)
UCHIJAA InfernalMobs{1.6.6} [Infernal Mobs] (InfernalMobs-1.7.10.jar)
UCHIJAA lootbags{1.8.1} [Loot Bags] (LootBags-1.7.10-1.8.1.jar)
UCHIJAA lycanitesmobs{1.13.0.5 - MC 1.7.10} [Lycanites Mobs] (LycanitesMobsComplete 1.13.0.5 [1.7.10].jar)
UCHIJAA arcticmobs{1.13.0.5 - MC 1.7.10} [Lycanites Arctic Mobs] (LycanitesMobsComplete 1.13.0.5 [1.7.10].jar)
UCHIJAA demonmobs{1.13.0.5 - MC 1.7.10} [Lycanites Demon Mobs] (LycanitesMobsComplete 1.13.0.5 [1.7.10].jar)
UCHIJAA desertmobs{1.13.0.5 - MC 1.7.10} [Lycanites Desert Mobs] (LycanitesMobsComplete 1.13.0.5 [1.7.10].jar)
UCHIJAA forestmobs{1.13.0.5 - MC 1.7.10} [Lycanites Forest Mobs] (LycanitesMobsComplete 1.13.0.5 [1.7.10].jar)
UCHIJAA freshwatermobs{1.13.0.5 - MC 1.7.10} [Lycanites Freshwater Mobs] (LycanitesMobsComplete 1.13.0.5 [1.7.10].jar)
UCHIJAA infernomobs{1.13.0.5 - MC 1.7.10} [Lycanites Inferno Mobs] (LycanitesMobsComplete 1.13.0.5 [1.7.10].jar)
UCHIJAA junglemobs{1.13.0.5 - MC 1.7.10} [Lycanites Jungle Mobs] (LycanitesMobsComplete 1.13.0.5 [1.7.10].jar)
UCHIJAA mountainmobs{1.13.0.5 - MC 1.7.10} [Lycanites Mountain Mobs] (LycanitesMobsComplete 1.13.0.5 [1.7.10].jar)
UCHIJAA plainsmobs{1.13.0.5 - MC 1.7.10} [Lycanites Plains Mobs] (LycanitesMobsComplete 1.13.0.5 [1.7.10].jar)
UCHIJAA saltwatermobs{1.13.0.5 - MC 1.7.10} [Lycanites Saltwater Mobs] (LycanitesMobsComplete 1.13.0.5 [1.7.10].jar)
UCHIJAA shadowmobs{1.13.0.5 - MC 1.7.10} [Lycanites Shadow Mobs] (LycanitesMobsComplete 1.13.0.5 [1.7.10].jar)
UCHIJAA swampmobs{1.13.0.5 - MC 1.7.10} [Lycanites Swamp Mobs] (LycanitesMobsComplete 1.13.0.5 [1.7.10].jar)
UCHIJAA malisiscore{1.7.10-0.14.3} [MalisisCore] (malisiscore-1.7.10-0.14.3.jar)
UCHIJAA malisisdoors{1.7.10-1.13.1} [Malisis' Doors] (malisisdoors-1.7.10-1.13.1.jar)
UCHIJAA mininghats{1.3} [Mining Hats] (mininghats-1.3.jar)
UCHIJAA MobAmputation{4.0.0} [MobAmputation] (Mob-Amputation-Mod-1.7.10.jar)
UCHIJAA MobDismemberment{4.0.0} [MobDismemberment] (Mob-Dismemberment-Mod-1.7.10.jar)
UCHIJAA mobdeathmessages{1.2} [Mob Death Messages] (mobdeathmessages-1.2.jar)
UCHIJAA Morph{0.9.2} [Morph] (Morph-Beta-0.9.2.jar)
UCHIJAA MultiPageChest{1.3.4} [Multi Page Chest] (MultiPageChest-1.3.4-MC1.7.10.jar)
UCHIJAA MutantCreatures{1.4.9} [Mutant Creatures] (MutantCreatures-1.7.10-1.4.9.jar)
UCHIJAA mwaw{1.7.10-0.0.7} [Elemental Witch Mod] (mwaw-0.0.7-1.7.10.jar)
UCHIJAA recipehandler{1.7.10} [NoMoreRecipeConflict] (NoMoreRecipeConflict-0.3(1.7.10).jar)
UCHIJAA obscore{1.3.3} [ObsCore] (obscore-1.3.3_mc1.7.10.jar)
UCHIJAA obstrophiesaoa{1.3.1} [ObsTrophies] (obstrophiesaoa-1.3.1_mc1.7.10.jar)
UCHIJAA OreSpawn{1.7.10.20.3} [OreSpawn] (orespawn-1.7.10-20.3.zip)
UCHIJAA pacman{1.0.8} [Killer Pacman] (PacmanMod-1.0.8.jar)
UCHIJAA randomitemod{0.0.1} [Randomite Mod] (Randomite Mod.zip)
UCHIJAA randomite{2.0} [Randomite] (Randomite-Mod-1.7.10.jar)
UCHIJAA SandyOres{1.1.0} [SandyOres] (Sandy-Ores-Mod-1.7.10.zip)
UCHIJAA SpecialAI{1.1.1} [Special AI] (SpecialAI-1.7.10-1.1.1.jar)
UCHIJAA SpecialMobs{3.2.2} [Special Mobs] (SpecialMobs-1.7.10-3.2.2.jar)
UCHIJAA sureen{1.7.10-1.0} [Sureen Core] (Sureen-Core-1.6.jar)
UCHIJAA dna948{3.1} [The Last Sword You Will Ever Need Mod] (The_Last_Sword_You_Will_Ever_Need_Mod-1.7.10-3.4.jar)
UCHIJAA TwilightForest{2.3.7} [The Twilight Forest] (twilightforest-1.7.10-2.3.7.jar)
UCHIJAA Uncrafted{1.0.0} [Uncrafted] (Uncrafted.zip)
UCHIJAA Waila{1.5.10} [Waila] (Waila-1.5.10_1.7.10.jar)
UCHIJAA WailaHarvestability{1.1.6} [Waila Harvestability] (WailaHarvestability-mc1.7.10-1.1.6.jar)
UCHIJAA youtubers{1.8.0} [Youtubers+ Mod] (youtubers-1.8.0-MC1.7.10.jar)
Profiler Position: N/A (disabled)
Vec3 Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Player Count: 0 / 8; []
Type: Integrated Server (map_client.txt)
Is Modded: Definitely; Client brand changed to 'fml,forge'
OptiFine Version: OptiFine_1.7.10_HD_U_D3
Render Distance Chunks: 8
Mipmaps: 4
Anisotropic Filtering: 1
Antialiasing: 0
Multitexture: false
OpenGlVersion: 4.3.0 - Build 10.18.14.4170
OpenGlRenderer: Intel(R) HD Graphics 4400
OpenGlVendor: Intel
CpuCount: 4