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maybe you guys can figure this out cause I have no clue all I know it has something to do with memory. ---- Minecraft Crash Report ----
// Surprise! Haha. Well, this is awkward.
Time: 12/3/12 10:37 PM
Description: Exception ticking world
java.util.ConcurrentModificationException
at java.util.HashMap$Ha­erator.nextEntry(Unknown Source)
at java.util.HashMap$KeyIterator.next(Unknown Source)
at im.b(ChunkProviderServer.java:309)
at in.b(WorldServer.java:124)
at net.minecraft.server.MinecraftServer.r(MinecraftServer.java:657)
at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:587)
at bdo.q(IntegratedServer.java:110)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:494)
at fy.run(SourceFile:856)

A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------
-- Head --
Stacktrace:
at java.util.HashMap$Ha­erator.nextEntry(Unknown Source)
at java.util.HashMap$KeyIterator.next(Unknown Source)
at im.b(ChunkProviderServer.java:309)
at in.b(WorldServer.java:124)
-- Affected level --
Details:
Level name: New World
All players: 0 total; []
Chunk stats: ServerChunkCache: 1902 Drop: 1369
Level seed: -7320393765570213844
Level generator: ID 00 - default, ver 1. Features enabled: true
Level generator options:
Level spawn location: World: (-140,64,240), Chunk: (at 4,4,0 in -9,15; contains blocks -144,0,240 to -129,255,255), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
Level time: 55582 game time, 96292 day time
Level dimension: 0
Level storage version: 0x04ABD - Anvil
Level weather: Rain time: 15158 (now: false), thunder time: 61298 (now: false)
Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: false
Stacktrace:
at net.minecraft.server.MinecraftServer.r(MinecraftServer.java:657)
at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:587)
at bdo.q(IntegratedServer.java:110)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:494)
at fy.run(SourceFile:856)
-- System Details --
Details:
Minecraft Version: 1.4.5
Operating System: Windows 8 (x86) version 6.2
Java Version: 1.7.0_09, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 851571728 bytes (812 MB) / 1532624896 bytes (1461 MB) up to 1532624896 bytes (1461 MB)
JVM Flags: 2 total; -Xms1512m -Xmx1512m
AABB Pool Size: 7612 (426272 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Suspicious classes: FML and Forge are installed
IntCache: cache: 0, tcache: 0, allocated: 3, tallocated: 63
FML: MCP v7.23 FML v4.5.2.459 Minecraft Forge 6.4.0.397 Optifine OptiFine_1.4.5_HD_U_D3 12 mods loaded, 12 mods active
mcp [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
FML [Forge Mod Loader] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
Forge [Minecraft Forge] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
mod_CodeChickenCore [CodeChicken Core] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
mod_NotEnoughItems [Not Enough Items] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
IronChest [Iron Chest] (ironchest-universal-4.4.0.192.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
IC2 [IndustrialCraft 2] (industrialcraft-2_1.109.113-lf.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
GregTech_Addon [GregTech-Addon] (gregtechmod.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
mod_ReiMinimap [mod_ReiMinimap] ([1.4.5]ReiMinimap_v3.2_05.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
mod_Timber [Timber!] (Timber! (1.4.4).zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
StevesCarts [Steve's Carts] (StevesCarts2.0.0.a31.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
mod_JourneyMap [mod_JourneyMap] (JourneyMap1.9_MC1.4.5.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
Profiler Position: N/A (disabled)
Vec3 Pool Size: 2206 (123536 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 'forge,fml'