Minecraft Forums

I was playing Minecraft with the Feed the Beast mod pack.
I was just walking around and minecraft just randomly crashed.

Here's the Error report:

--- BEGIN ERROR REPORT 55aeee4e --------
Generated 12/15/12 5:40 PM
- Minecraft Version: 1.4.2
- Operating System: Windows XP (x86) version 5.1
- Java Version: 1.6.0_31, Sun Microsystems Inc.
- Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Sun Microsystems Inc.
- Memory: 285746200 bytes (272 MB) / 892551168 bytes (851 MB) up to 1037959168 bytes (989 MB)
- JVM Flags: 2 total; -Xms512M -Xmx1024M
- AABB Pool Size: 2456 (137536 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
- FML: MCP v7.19 FML v4.2.18.433 Minecraft Forge 6.0.1.355 Optifine OptiFine_1.4.2_HD_U_B1 31 mods loaded, 31 mods active
mcp [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
FML [Forge Mod Loader] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
Forge [Minecraft Forge] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
mod_CodeChickenCore [CodeChicken Core] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
mod_NotEnoughItems [Not Enough Items] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
IC2 [IndustrialCraft 2] (Industrialcraft-2_1.108.71-lf.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
AdvancedMachines [IC2 Advanced Machines Addon] (AdvancedMachines 4.4.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
AdvancedSolarPanel [Advanced Solar Panels] (AdvancedSolarPanels_3_2_0.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
BuildCraft|Core [BuildCraft] (BuildCraft-3.1.8.206.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
BuildCraft|Energy [BC Energy] (BuildCraft-3.1.8.206.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
BuildCraft|Transport [BC Transport] (BuildCraft-3.1.8.206.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
BuildCraft|Builders [BC Builders] (BuildCraft-3.1.8.206.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
BuildCraft|Factory [BC Factory] (BuildCraft-3.1.8.206.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
BuildCraft|Silicon [BC Silicon] (BuildCraft-3.1.8.206.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
ComputerCraft [ComputerCraft] (ComputerCraft1.46.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
CCTurtle [ComputerCraft Turtles] (ComputerCraft1.46.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
EnderStorage [EnderStorage] (EnderStorage 1.2.1.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
ExtrabiomesXL [ExtrabiomesXL] (ExtrabiomesXL-3.3.0.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
Forestry [Forestry for Minecraft] (Forestry-1.6.0.0pre6.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
ForgeIRC [ForgeIRC] (ForgeIRC-v1.0.11.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
IC2NuclearControl [Nuclear Control] (IC2NuclearControl-1.4.1.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
mod_InvTweaks [Inventory Tweaks] (InvTweaks-1.44-1.4.2.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
IronChest [Iron Chest] (Ironchest-4.2.1.120.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
Mystcraft [Mystcraft] (Mystcraft-1.4.1-0.9.3.02.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
PortalGun [PortalGun] (portalgun1.4.2v0.3_universal.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
Railcraft [Railcraft] (Railcraft_6.7.0.0.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
mod_ReiMinimap [mod_ReiMinimap] (ReiMinimap_v3.2_05.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
ThermalExpansion|Core [Thermal Expansion] (ThermalExpansion-2.0.5.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
ThermalExpansion|Factory [Factory] (ThermalExpansion-2.0.5.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
ThermalExpansion|Energy [Energy] (ThermalExpansion-2.0.5.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
GregTech_Addon [GregTech-Addon] (GregTechmod.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
- Is Modded: Definitely; 'forge,fml'
- Profiler Position: N/A (disabled)
- Vec3 Pool Size: 261 (14616 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
- Player Count: 1 / 8; [ih['Goldfish_Vender'/14911, l='FTB', x=-4.68, y=62.00, z=-99.09]]
- World FTB Entities: 0 total; []
- World FTB Players: 0 total; []
- World FTB Chunk Stats: ServerChunkCache: 0 Drop: 0
- Type: Integrated Server
java.util.ConcurrentModificationException
at java.util.AbstractList$Itr.checkForComodification(Unknown Source)
at java.util.AbstractList$Itr.next(Unknown Source)
at ib.b(PlayerManager.java:67)
at ie.b(WorldServer.java:136)
at net.minecraft.server.MinecraftServer.r(MinecraftServer.java:653)
at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:590)
at bcb.q(IntegratedServer.java:110)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:497)
at fp.run(SourceFile:818)
--- END ERROR REPORT 6df10a99 ----------

Can someone please tell me what this means?

~Wigger