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im having a wheird crash since installing thaumcraft 3.

this is the crash i having.
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---- Minecraft Crash Report ----
// Would you like a cupcake?
Time: 12/2/12 1:22 AM
Description: Failed to start game
java.lang.ClassCastException: java.util.TreeMap cannot be cast to net.minecraftforge.common.ConfigCategory
at net.minecraftforge.common.Configuration.getCategory(Configuration.java:708)
at net.minecraftforge.common.Configuration.get(Configuration.java:360)
at net.minecraftforge.common.Configuration.get(Configuration.java:272)
at net.minecraftforge.common.Configuration.get(Configuration.java:267)
at railcraft.common.util.liquids.LiquidManager.getLiquidFilterId(LiquidManager.java:215)
at railcraft.common.modules.ModuleTransport.postInit(ModuleTransport.java:297)
at railcraft.common.modules.ModuleManager.postInit(ModuleManager.java:189)
at railcraft.common.modules.ModuleManager.postInit(ModuleManager.java:102)
at railcraft.common.core.Railcraft.postInit(Railcraft.java:191)
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 cpw.mods.fml.common.FMLModContainer.handleModStateEvent(FMLModContainer.java:440)
at sun.reflect.GeneratedMethodAccessor3.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.google.common.eventbus.EventHandler.handleEvent(EventHandler.java:69)
at com.google.common.eventbus.SynchronizedEventHandler.handleEvent(SynchronizedEventHandler.java:45)
at com.google.common.eventbus.EventBus.dispatch(EventBus.java:317)
at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:300)
at com.google.common.eventbus.EventBus.post(EventBus.java:268)
at cpw.mods.fml.common.LoadController.propogateStateMessage(LoadController.java:140)
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 com.google.common.eventbus.EventHandler.handleEvent(EventHandler.java:69)
at com.google.common.eventbus.SynchronizedEventHandler.handleEvent(SynchronizedEventHandler.java:45)
at com.google.common.eventbus.EventBus.dispatch(EventBus.java:317)
at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:300)
at com.google.common.eventbus.EventBus.post(EventBus.java:268)
at cpw.mods.fml.common.LoadController.distributeStateMessage(LoadController.java:83)
at cpw.mods.fml.common.Loader.initializeMods(Loader.java:654)
at cpw.mods.fml.client.FMLClientHandler.finishMinecraftLoading(FMLClientHandler.java:197)
at net.minecraft.client.Minecraft.a(Minecraft.java:469)
at net.minecraft.client.Minecraft.run(Minecraft.java:756)
at java.lang.Thread.run(Unknown Source)

A detailed walkthrough of the error, its code path and all known details is as follows:
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-- System Details --
Details:
Minecraft Version: 1.4.5
Operating System: Windows 7 (x86) version 6.1
Java Version: 1.7.0_07, Oracle Corporation
Java VM Version: Java HotSpot™ Client VM (mixed mode, sharing), Oracle Corporation
Memory: 358649232 bytes (342 MB) / 518979584 bytes (494 MB) up to 518979584 bytes (494 MB)
JVM Flags: 2 total; -Xms512m -Xmx512m
AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Suspicious classes: FML and Forge are installed
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
FML: MCP v7.23 FML v4.5.2.459 Minecraft Forge 6.4.1.409 Optifine OptiFine_1.4.5_HD_U_D3 35 mods loaded, 35 mods active
mcp [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
FML [Forge Mod Loader] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
Forge [Minecraft Forge] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
mod_CodeChickenCore [CodeChicken Core] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
mod_NotEnoughItems [Not Enough Items] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
mod_StatusEffectHUD [StatusEffectHUD] ([1.4.5]StatusEffectHUDv1.7.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
mod_DirectionHUD [DirectionHUD] ([1.4.5]DirectionHUDv1.8.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
mod_ArmorStatusHUD [ArmorStatusHUD] ([1.4.5]ArmorStatusHUDv1.4.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
ImmibisCore [Immibis Core] (immibis-core_51.0.3_for_1.4.5.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
ImmibisPeripherals [Immibis's Peripherals] (immibis-peripherals_51.0.1_for_1.4.5.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
IC2 [IndustrialCraft 2] (industrialcraft-2_1.109.113-lf.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
BuildCraft|Core [BuildCraft] (buildcraft-A-3.2.0.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
BuildCraft|Energy [BC Energy] (buildcraft-A-3.2.0.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
BuildCraft|Transport [BC Transport] (buildcraft-A-3.2.0.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
Additional-Buildcraft-Objects [Additional Buildcraft Objects] (buildcraft-Z-additional-buildcraft-objects-0.9.4.64.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
snyke7_Transformers [Transformers] (Transformers_v1.7.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
AdvancedMachines [IC2 Advanced Machines Addon] (AdvancedMachines_4.5_1.4.5.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
AdvancedPowerManagement [Advanced Power Management] (AdvancedPowerManagement-1.1.40-IC2_1.109.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
StevesCarts [Steve's Carts] (StevesCarts2.0.0.a30.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
Mekanism [Mekanism] (Mekanism.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
BasicComponents [Basic Components] (BasicComponents_v1.1.3.276.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
ICBM [ICBM] (ICBM_v0.6.2.68.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
ElectricExpansion [Electric Expansion] (ElectricExpansion_v0.3.10(1.4.5).jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
Mystcraft [Mystcraft] (mystcraft-uni-1.4.4-0.9.4.05.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
ModularForceFieldSystem [Modular ForceField System V2] (ModularForceFieldSystemV2.2.8.1.5.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
IC2NuclearControl [Nuclear Control] (IC2NuclearControl-1.4.2.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
BuildCraft|Silicon [BC Silicon] (buildcraft-A-3.2.0.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
APUnofficial [Additional Pipes Unofficial] (AdditionalPipes-2.1.3u28b2.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
Forestry [Forestry for Minecraft] (forestry-A-1.6.2.0.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
BuildCraft|Builders [BC Builders] (buildcraft-A-3.2.0.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
BuildCraft|Factory [BC Factory] (buildcraft-A-3.2.0.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
Railcraft [Railcraft] (Railcraft_6.8.0.0.zip) Unloaded->Constructed->Pre-initialized->Initialized->Errored
ComputerCraft [ComputerCraft] (ComputerCraft) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
CCTurtle [ComputerCraft Turtles] (ComputerCraft) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
NEIPlugins [NEI Plugins] (NEIPlugins-1.0.2.2.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
LWJGL: 2.4.2
OpenGL: Mobile Intel® 4 Series Express Chipset Family GL version 2.1.0 - Build 8.15.10.1883, Intel
Is Modded: Definitely; Client brand changed to 'forge,fml'
Type: Client (map_client.txt)
Texture Pack: Default
Profiler Position: N/A (disabled)
Vec3 Pool Size: ~~ERROR~~ NullPointerException: null
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any help would be rewarded with many

Hey i think i isolated the issue your having because i'm having the same problem but i believe i figured it out, it seems to me like its being caused by railcraft/ stevescarts because my minecraft now is working fine without railcraft and stevescarts installed

Quote from chris53022

Hey i think i isolated the issue your having because i'm having the same problem but i believe i figured it out, it seems to me like its being caused by railcraft/ stevescarts because my minecraft now is working fine without railcraft and stevescarts installed

i thught so to but when i removed the railcraft mod and thaumcraft i still got this error a few times after.

its working for me, im also using multimc too tho, so idk i trouble shooted it by installing them one by one using multimc and i got it to work, and when i installed railcraft i got the error again.