Minecraft Forums

My game is heavily modded, but it is relatively stable. It does crash, though. These crashes appear to be random. Here's the error report, if anyone can help with it. Thank you in advance.

I cant seem to add attachments.

---- Minecraft Crash Report ----
// I feel sad now
Time: 7/5/13 7:57 PM
Description: Exception in server tick loop
java.util.ConcurrentModificationException
at java.util.ArrayList$Itr.checkForComodification(Unknown Source)
at java.util.ArrayList$Itr.next(Unknown Source)
at codechicken.chunkloader.PlayerChunkViewerManager.calculateChunkChanges(PlayerChunkViewerManager.java:155)
at codechicken.chunkloader.ChunkLoaderEventHandler.tickEnd(ChunkLoaderEventHandler.java:40)
at cpw.mods.fml.common.SingleIntervalHandler.tickEnd(SingleIntervalHandler.java:22)
at cpw.mods.fml.common.FMLCommonHandler.tickEnd(FMLCommonHandler.java:138)
at cpw.mods.fml.common.FMLCommonHandler.onPostWorldTick(FMLCommonHandler.java:282)
at net.minecraft.server.MinecraftServer.r(MinecraftServer.java:688)
at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:598)
at bdz.q(IntegratedServer.java:123)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:497)
at fy.run(SourceFile:849)

A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------
-- System Details --
Details:
Minecraft Version: 1.4.6
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.7.0_13, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 637161056 bytes (607 MB) / 1004929024 bytes (958 MB) up to 1056309248 bytes (1007 MB)
JVM Flags: 5 total; -Xms256M -Xmx1024M -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:+AggressiveOpts
AABB Pool Size: 3204 (179424 bytes; 0 MB) allocated, 2378 (133168 bytes; 0 MB) used
Suspicious classes: FML and Forge are installed
IntCache: cache: 0, tcache: 0, allocated: 1, tallocated: 63
FML: MCP v7.25 FML v4.6.17.515 Minecraft Forge 6.5.0.489 Feed The Beast Mod Pack 65 mods loaded, 65 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
GuiAPI [GuiAPI] (GuiAPI-0.15.2-1.4.6.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
mod_ReiMinimap [mod_ReiMinimap] ([1.4.6]ReiMinimap_v3.2_06.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
mod_treecapitator [TreeCapitator] ([1.4.6]Treecapitator.ML.1.4.6.r01.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
Backpack [Backpack] (backpack-1.5.7-1.4.6 (1).zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
BuildCraft|Core [BuildCraft] (buildcraft-A-3.3.0.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
BuildCraft|Energy [BC Energy] (buildcraft-A-3.3.0.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
BuildCraft|Factory [BC Factory] (buildcraft-A-3.3.0.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
IC2 [IndustrialCraft 2] (industrialcraft-2_1.112.170-lf.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
BCIC2Crossover [BC-IC2 Crossover Mod] (BCIC2crossover 2.0.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
BuildCraft|Builders [BC Builders] (buildcraft-A-3.3.0.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
BuildCraft|Transport [BC Transport] (buildcraft-A-3.3.0.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
BuildCraft|Silicon [BC Silicon] (buildcraft-A-3.3.0.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
ChargePads [Charge Pads] (chargepads-universal-2.3.0.58.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
ChickenChunks [ChickenChunks] (ChickenChunks 1.2.1.1.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
CompactSolars [Compact Solar Arrays] (compactsolars-universal-1.4.6-3.2.0.21.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
ComputerCraft [ComputerCraft] (ComputerCraft1.481.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
CCTurtle [ComputerCraft Turtles] (ComputerCraft1.481.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
CustomSpawner [DrZhark's CustomSpawner] (CustomMobSpawner 1.11.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
MoCreatures [DrZhark's Mo'Creatures Mod] (DrZharks MoCreatures Mod v4.5.1.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
EnderStorage [EnderStorage] (EnderStorage 1.3.1.1.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
ExtrabiomesXL [ExtrabiomesXL] (ExtrabiomesXL-universal-1.4.7-3.8.0.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
factorization [Factorization] (Factorization-0.7.10.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
Forestry [Forestry for Minecraft] (forestry-A-1.7.0.1.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
GraviGun [GraviGun] (GravityGun1.4.6v1.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
IC2NuclearControl [Nuclear Control] (IC2NuclearControl-1.4.5.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
mod_InvTweaks [Inventory Tweaks] (InventoryTweaks_v1.49_(1.4.6).zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
IronChest [Iron Chest] (ironchest-universal-1.4.7-4.5.2.213.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
Millenaire [Millénaire] (millenaire4.0.2.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
MiscPeripherals [MiscPeripherals] (miscperipherals-2.3.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
GraviSuite [Gravitation Suite] (mod_zGraviSuite_1_6.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
ModularForceFieldSystem [Modular ForceField System V2] (ModularForceFieldSystemV2.2.8.2.14.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
Mystcraft [Mystcraft] (mystcraft-uni-1.4.6-0.9.5.00.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
NEIPlugins [NEI Plugins] (NEIPlugins-1.0.4.1.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
ObsidiPlates [Obsidian Pressure Plates] (obsidiplates-universal-1.2.0.3.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
OmniTools [OmniTools] (OmniTools-2.2.5.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
PortalGun [Portal Gun] (PortalGun1.4.7v2.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
Railcraft [Railcraft] (Railcraft_1.4.6-6.13.1.0.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
RedPowerCore [RedPower] (RedPowerCore-2.0pr6.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
RedPowerBase [RP Base] (RedPowerCore-2.0pr6.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
RedPowerMachine [RP Machine] (RedPowerMechanical-2.0pr6.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
RedPowerCompat [RP Compat] (RedPowerCompat-2.0pr6.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
RedPowerWiring [RP Wiring] (RedPowerDigital-2.0pr6.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
RedPowerLogic [RP Logic] (RedPowerDigital-2.0pr6.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
RedPowerLighting [RP Lighting] (RedPowerDigital-2.0pr6.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
RedPowerWorld [RP World] (RedPowerMechanical-2.0pr6.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
RedPowerControl [RP Control] (RedPowerMechanical-2.0pr6.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
RopesPlus [Ropes+] (RopePlus_1.4.6.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
StevesCarts [Steve's Carts] (StevesCarts2.0.0.a42.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
Thaumcraft [Thaumcraft] (Thaumcraft3.0.1c.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
ThermalExpansion [Thermal Expansion] (ThermalExpansion-2.1.6.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
ThermalExpansion|Factory [Factory] (ThermalExpansion-2.1.6.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
ThermalExpansion|Energy [Energy] (ThermalExpansion-2.1.6.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
ThermalExpansion|Transport [Transport] (ThermalExpansion-2.1.6.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
ThermalExpansion|NEI [NEI] (ThermalExpansion-NEI-2.1.6.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
weaponmod [Balkon's WeaponMod] (Weaponmod.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
WR-CBE|Core [WR-CBE Core] (WR-CBE Core 1.3.2.4.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
WR-CBE|Addons [WR-CBE Addons] (WR-CBE Addons 1.3.2.4.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
WR-CBE|RedPower [WR-CBE RedPower] (WR-CBE RedPower 1.3.2.4.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
XyCraft [XyCraft] (xycraft-universal-1.4.6-0.9.44.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
IDResolver [ID Resolver] (IDResolver-1.4.6.0.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
Profiler Position: N/A (disabled)
Vec3 Pool Size: 2100 (117600 bytes; 0 MB) allocated, 1572 (88032 bytes; 0 MB) used
Player Count: 1 / 8; [iq['Dark_Author'/150, l='eriks creative', x=-116.38, y=101.00, z=415.12]]
Type: Integrated Server (map_client.txt)
Is Modded: Definitely; Client brand changed to 'forge,fml'

Crafterguy, thank you for the advice. I'm currently running version 1.4.6 with the FeedTheBeast mod pack. I added a few mods to that pack and got compatibility "patches" (like a Buildcraft/Industrial Craft converter. As far as I am aware, all the mods are for version 1.4.6.

I do not know how to allocate more ram to Minecraft. If you could explain to me how to do it, I will be able to.

It is also worth mentioning that I just found out that I have absolutely no crashes (so far, and its been three hours) when playing on peaceful mode.