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I just wanna know what might be causing the problem.

Here's the crash report:

---- Minecraft Crash Report ----
// Uh... Did I do that?

Time: 5/4/15 10:20 PM
Description: Exception in server tick loop

java.util.ConcurrentModificationException
at java.util.HashMap$HashIterator.nextNode(Unknown Source)
at java.util.HashMap$ValueIterator.next(Unknown Source)
at net.minecraft.world.gen.structure.MapGenStructure.func_75051_a(MapGenStructure.java:89)
at net.minecraft.world.gen.ChunkProviderGenerate.func_73153_a(ChunkProviderGenerate.java:382)
at net.minecraft.world.gen.ChunkProviderServer.func_73153_a(ChunkProviderServer.java:279)
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:78)
at net.minecraft.server.integrated.IntegratedServer.func_71197_b(IntegratedServer.java:92)
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 (x86) version 6.1
Java Version: 1.8.0_45, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 104265640 bytes (99 MB) / 394067968 bytes (375 MB) up to 1037959168 bytes (989 MB)
JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G
AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
IntCache: cache: 1, tcache: 1, allocated: 12, tallocated: 94
FML: MCP v9.05 FML v7.10.85.1291 Minecraft Forge 10.13.2.1291 55 mods loaded, 55 mods active
mcp{9.05} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
FML{7.10.85.1291} [Forge Mod Loader] (forge-1.7.10-10.13.2.1291.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
Forge{10.13.2.1291} [Minecraft Forge] (forge-1.7.10-10.13.2.1291.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
bettersleepingcore{1.0} [Better Sleeping Core] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
CodeChickenCore{1.0.2.9} [CodeChicken Core] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
itemphysic{0.8.3} [ItemPhysic] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
NotEnoughItems{1.0.2.15} [Not Enough Items] (NotEnoughItems-1.7.10-1.0.2.15-universal.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
furnace3d{1.2.0} [Furnace 3D] (3D-Furnace-Mod-1.7.10.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
deconstruction{2.2.5} [The Deconstruction Mod] ([MC1.7.10]deconstruction[v2.2.5].jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
AppleCore{1.1.0} [AppleCore] (AppleCore-mc1.7.10-1.1.0.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
Backpack{2.0.0} [Backpack] (Backpacks-Mod.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
BetterFoliage{1.0.8} [Better Foliage] (BetterFoliage-mc1.7-1.0.8.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
bettersleeping{BS_1710} [Better Sleeping] (BetterSleeping-1.7.10-0.1.0-4.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
BiblioCraft{1.10.3} [BiblioCraft] (BiblioCraft[v1.10.3][MC1.7.10].jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
bigtrees{1.7.2b} [The BigTrees Mod] (BigTrees-172b-forge1060.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
craftguide{1.6.8.1} [CraftGuide] (CraftGuide-Mod-1.7.10.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
CustomSpawner{3.3.0} [DrZhark's CustomSpawner] (CustomMobSpawner 3.3.0.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
MoCreatures{6.3.1} [DrZhark's Mo'Creatures Mod] (DrZharks MoCreatures Mod v6.3.1.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
SlimevoidLib{2.0.4.7} [Slimevoid Library] (SlimevoidLibrary-2.0.4.7.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
DynamicTransport{0.1.2.0} [Dynamic Transport] (DynamicTransport-0.1.2.0.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
Easter Egg Mod{1.0} [Easter Egg Mod] (EasterEggMod V1.0.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
enviromine{1.3.113} [EnviroMine] (EnviroMine-v1.3.113.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
extvil{1.7.10-1.3} [Extended_Villages] (Extended-Villages-Mod-1.7.10.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
FastCraft{1.9} [FastCraft] (fastcraft-1.9.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
Growthcraft{2.1.0a} [Growthcraft] (growthcraft-core-1.7.10-2.1.0a.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
Growthcraft|Cellar{2.1.0a} [Growthcraft Cellar] (growthcraft-cellar-1.7.10-2.1.0a.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
Growthcraft|Apples{2.1.0} [Growthcraft Apples] (growthcraft-apples-1.7.10-2.1.0.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
Growthcraft|Bamboo{2.1.0} [Growthcraft Bamboo] (growthcraft-bamboo-1.7.10-2.1.0.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
Growthcraft|Bees{2.1.0} [Growthcraft Bees] (growthcraft-bees-1.7.10-2.1.0.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
Growthcraft|Fishtrap{2.1.0a} [Growthcraft Fishtrap] (growthcraft-fishtrap-1.7.10-2.1.0a.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
Growthcraft|Grapes{2.1.0} [Growthcraft Grapes] (growthcraft-grapes-1.7.10-2.1.0.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
Growthcraft|Hops{2.1.0} [Growthcraft Hops] (growthcraft-hops-1.7.10-2.1.0.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
Growthcraft|Rice{2.1.0a} [Growthcraft Rice] (growthcraft-rice-1.7.10-2.1.0a.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
iChunUtil{4.0.0} [iChunUtil] (iChun-Util-Mod-1.7.10.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
LotsOfFood{1.7.10} [Lots of Food] (Lots of Food-1.7.10 v6.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
lucky{5.1.0} [Lucky Block] (Lucky-Block-Mod-1.7.10.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
Timber{1.0} [Timber] (Lumberjack-1.7.10-1.0.0.2.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
RadixCore{2.0.1} [RadixCore] (RadixCore-2.0.1-1.7.10-universal.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
MCA{5.0.0} [Minecraft Comes Alive] (MCA-5.0.0-1.7.10-universal.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
millenaire{6.0.0pb2} [Millénaire] (millenaire-6.0.0pb2.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
movillages{1.2.1} [Mo' Villages] (MoVillages-1.3.1.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
cfm{3.4.7} [§9MrCrayfish's Furniture Mod] (MrCrayfishFurnitureModv3.4.7(1.7.10) (1).jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
harvestcraft{1.7.10b} [Pam's HarvestCraft] (Pam's HarvestCraft 1.7.10c.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
PetBat{1.3.6} [Pet Bat] (PetBat-1.7.10.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
PigManure{1.0.0} [Pig Manure] (Pig-Manure-Mod-1.7.10 (1).jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
quiverchevsky{b100} [QuiverBow] (QuiverBow_1.7.10_b100.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
realisticpain{1.1} [Realistic Pain] (Realistic-Pain-Mod-1.7.10.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
ReiMinimap{1.7.10} [Rei's Minimap] (Reis-Minimap-Mod-1.7.10.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
AS_Ruins{14.7} [Ruins Spawning System] (Ruins-1.7.10.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
Shatter{4.0.0} [Shatter] (Shatter-Mod-1.7.10.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
kitchen{1.3.9} [The Kitchen Mod] (TheKitchenMod-1.3.9-1.7.2-10.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
Waila{1.5.5} [Waila] (Waila-1.5.5_1.7.10.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
WailaHarvestability{1.1.0} [Waila Harvestability] (WailaHarvestability-mc1.7.x-1.1.0.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
weaponmod{v1.14.3} [Balkon's WeaponMod] (weaponmod-1.14.3.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
HungerOverhaul{1.7.10-beta.6.jenkins70} [Hunger Overhaul] (HungerOverhaul-1.7.10-beta.6.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
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'

yah that **** **** crash