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I can't figure out what my problem is. I'm okay with removing mods or editing their config files, I just can't figure out what the issue is, let alone which mod is causing it. Any help, suggestions, or ideas are much appreciated!

---- Minecraft Crash Report ----
// Daisy, daisy...

Time: 5/14/15 1:40 AM
Description: Unexpected error

java.util.ConcurrentModificationException
at java.util.HashMap$HashIterator.nextNode(Unknown Source)
at java.util.HashMap$ValueIterator.next(Unknown Source)
at net.minecraft.world.chunk.Chunk.func_76607_a(Chunk.java:1264)
at net.minecraft.client.network.NetHandlerPlayClient.func_147269_a(Unknown Source)
at net.minecraft.network.play.server.S26PacketMapChunkBulk.func_148833_a(S26PacketMapChunkBulk.java:184)
at net.minecraft.network.play.server.S26PacketMapChunkBulk.func_148833_a(S26PacketMapChunkBulk.java:242)
at net.minecraft.network.NetworkManager.func_74428_b(NetworkManager.java:212)
at net.minecraft.client.multiplayer.PlayerControllerMP.func_78765_e(Unknown Source)
at net.minecraft.client.Minecraft.func_71407_l(Unknown Source)
at net.minecraft.client.Minecraft.func_71411_J(Unknown Source)
at net.minecraft.client.Minecraft.func_99999_d(Unknown Source)
at net.minecraft.client.main.Main.main(SourceFile:148)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- Head --
Stacktrace:
at java.util.HashMap$HashIterator.nextNode(Unknown Source)
at java.util.HashMap$ValueIterator.next(Unknown Source)
at net.minecraft.world.chunk.Chunk.func_76607_a(Chunk.java:1264)
at net.minecraft.client.network.NetHandlerPlayClient.func_147269_a(Unknown Source)
at net.minecraft.network.play.server.S26PacketMapChunkBulk.func_148833_a(S26PacketMapChunkBulk.java:184)
at net.minecraft.network.play.server.S26PacketMapChunkBulk.func_148833_a(S26PacketMapChunkBulk.java:242)
at net.minecraft.network.NetworkManager.func_74428_b(NetworkManager.java:212)
at net.minecraft.client.multiplayer.PlayerControllerMP.func_78765_e(Unknown Source)

-- Affected level --
Details:
Level name: MpServer
All players: 1 total; [EntityClientPlayerMP['Sage_Raziel'/287, l='MpServer', x=5.90, y=122.29, z=6493.55]]
Chunk stats: MultiplayerChunkCache: 466, 475
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (-20,64,264), Chunk: (at 12,4,8 in -2,16; contains blocks -32,0,256 to -17,255,271), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
Level time: 11234 game time, 11234 day time
Level dimension: 0
Level storage version: 0x00000 - Unknown?
Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: false
Forced entities: 63 total; [EntitySpider['Spider'/59395, l='MpServer', x=80.03, y=46.00, z=6429.97], EntityBat['Bat'/59422, l='MpServer', x=-63.50, y=62.00, z=6464.00], EntityBat['Bat'/59423, l='MpServer', x=34.51, y=58.65, z=6442.59], EntityZombie['Zombie'/59424, l='MpServer', x=81.69, y=46.00, z=6428.31], EntityBat['Bat'/59425, l='MpServer', x=30.69, y=56.09, z=6450.43], EntitySheep['Sheep'/59451, l='MpServer', x=85.50, y=71.00, z=6568.50], BlueSlime['Blue Slime'/59470, l='MpServer', x=-37.50, y=32.00, z=6475.50], EntityItem['item.tile.sapling.oak'/59471, l='MpServer', x=25.81, y=64.13, z=6488.69], EntityBat['Bat'/59495, l='MpServer', x=-1.50, y=53.00, z=6528.09], EntityCreeper['Creeper'/59505, l='MpServer', x=-37.77, y=47.41, z=6523.50], EntityItem['item.tile.sapling.oak'/59509, l='MpServer', x=27.11, y=64.13, z=6489.63], EntityBat['Bat'/59537, l='MpServer', x=70.75, y=32.00, z=6478.91], EntityBat['Bat'/59542, l='MpServer', x=-59.72, y=23.66, z=6497.13], EntityNautilus['Nautilus'/59543, l='MpServer', x=55.53, y=59.01, z=6394.55], EntityBat['Bat'/59555, l='MpServer', x=-57.00, y=23.66, z=6486.13], EntityBat['Bat'/59556, l='MpServer', x=48.91, y=43.00, z=6423.50], EntityBat['Bat'/59561, l='MpServer', x=47.97, y=43.00, z=6422.66], EntityBat['Bat'/59562, l='MpServer', x=63.13, y=45.00, z=6412.91], EntityCreeper['Creeper'/59577, l='MpServer', x=-34.50, y=46.00, z=6525.50], EntityZombie['Zombie'/59597, l='MpServer', x=29.50, y=68.00, z=6532.50], EntityCreeper['Creeper'/59638, l='MpServer', x=29.50, y=68.00, z=6534.50], EntityItem['item.item.yellowDust'/59655, l='MpServer', x=-21.17, y=51.13, z=6538.70], EntityItem['item.tile.sapling.oak'/59657, l='MpServer', x=26.22, y=72.13, z=6502.06], EntityClientPlayerMP['Sage_Raziel'/287, l='MpServer', x=5.90, y=122.29, z=6493.55], EntityFallingBlock['Falling Block'/59712, l='MpServer', x=-22.50, y=25.49, z=6595.50], EntityFallingBlock['Falling Block'/59714, l='MpServer', x=-22.50, y=25.49, z=6594.50], EntityFallingBlock['Falling Block'/59719, l='MpServer', x=-58.50, y=23.49, z=6599.50], EntityFallingBlock['Falling Block'/59724, l='MpServer', x=-22.50, y=29.49, z=6609.50], EntityFallingBlock['Falling Block'/59725, l='MpServer', x=-21.50, y=30.49, z=6609.50], EntityFallingBlock['Falling Block'/59726, l='MpServer', x=-20.50, y=31.49, z=6609.50], EntityFallingBlock['Falling Block'/59727, l='MpServer', x=-20.50, y=32.49, z=6608.50], EntityFallingBlock['Falling Block'/59728, l='MpServer', x=-19.50, y=31.49, z=6608.50], EntityBat['Bat'/59739, l='MpServer', x=70.38, y=34.00, z=6482.25], EntityBat['Bat'/59740, l='MpServer', x=69.47, y=34.00, z=6484.25], EntityBat['Bat'/59741, l='MpServer', x=79.44, y=34.00, z=6479.25], EntityFallingBlock['Falling Block'/59756, l='MpServer', x=-6.50, y=24.49, z=6623.50], EntitySkeleton['Skeleton'/59769, l='MpServer', x=68.91, y=33.00, z=6474.64], EntityFallingBlock['Falling Block'/59771, l='MpServer', x=87.50, y=27.49, z=6616.50], EntityFallingBlock['Falling Block'/59773, l='MpServer', x=86.50, y=27.49, z=6616.50], EntityFallingBlock['Falling Block'/59774, l='MpServer', x=85.50, y=28.49, z=6615.50], EntityFallingBlock['Falling Block'/59775, l='MpServer', x=84.50, y=28.49, z=6615.50], EntityFallingBlock['Falling Block'/59776, l='MpServer', x=85.50, y=28.49, z=6614.50], EntityFallingBlock['Falling Block'/59777, l='MpServer', x=84.50, y=28.49, z=6614.50], EntityZombie['Zombie'/59861, l='MpServer', x=66.50, y=34.00, z=6481.50], EntitySquid['Squid'/59867, l='MpServer', x=-39.50, y=62.00, z=6539.50], EntitySkeleton['Skeleton'/59875, l='MpServer', x=60.50, y=21.00, z=6531.50], EntityItem['item.item.seeds'/58965, l='MpServer', x=-41.81, y=63.13, z=6426.47], EntityFallingBlock['Falling Block'/58041, l='MpServer', x=118.50, y=29.52, z=6364.50], EntityItem['item.tile.sapling.oak'/59068, l='MpServer', x=26.34, y=72.13, z=6491.38], EntityItem['item.tile.sapling.oak'/59082, l='MpServer', x=28.66, y=73.13, z=6491.25], EntitySheep['Sheep'/59113, l='MpServer', x=49.50, y=67.00, z=6549.53], EntitySheep['Sheep'/59114, l='MpServer', x=49.50, y=67.00, z=6546.50], EntitySheep['Sheep'/59115, l='MpServer', x=49.50, y=67.00, z=6548.19], EntitySheep['Sheep'/59116, l='MpServer', x=52.50, y=66.00, z=6550.50], EntityChicken['Chicken'/59117, l='MpServer', x=40.50, y=69.00, z=6536.50], EntityChicken['Chicken'/59118, l='MpServer', x=41.50, y=69.00, z=6536.50], EntityChicken['Chicken'/59119, l='MpServer', x=42.50, y=68.00, z=6537.50], EntityChicken['Chicken'/59120, l='MpServer', x=40.50, y=87.00, z=6540.50], EntityBat['Bat'/59129, l='MpServer', x=7.28, y=27.00, z=6437.47], EntityFallingBlock['Falling Block'/57193, l='MpServer', x=119.50, y=28.51, z=6361.50], EntityFallingBlock['Falling Block'/57194, l='MpServer', x=118.50, y=29.51, z=6361.50], EntityFallingBlock['Falling Block'/57195, l='MpServer', x=117.50, y=29.51, z=6361.50], EntityFallingBlock['Falling Block'/57197, l='MpServer', x=118.50, y=29.51, z=6364.50]]
Retry entities: 0 total; []
Server brand: fml,forge
Server type: Integrated singleplayer server
Stacktrace:
at net.minecraft.client.multiplayer.WorldClient.func_72914_a(WorldClient.java:373)
at net.minecraft.client.Minecraft.func_71396_d(Unknown Source)
at net.minecraft.client.Minecraft.func_99999_d(Unknown Source)
at net.minecraft.client.main.Main.main(SourceFile:148)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

I'm having almost the same problem as you! Though my crash report is a little bit different from yours, at least the beginning part anyway. Unfortunately I still haven't found a fix. http://pastebin.com/kypViH2p Yes I know this is late. Can you tell me what mods you have installed? Maybe we can pin this down to a mod.