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I really need help with my Minecraft. I have 21 mods installed, and they never crashed the game together. I was playing Minecraft and it just crashed for no reason. The mods I have are: Mo' Creatures, TuxWeapons, AsgardShield, BattleTowers, TF2 Teleporters, Backpacks, Damage Indicators, Infernal Mobs, Mine and Blade Battlegear 2, Inventory Tweaks, NotEnoughItems, and TreeCapitator.

The Crash report was this:

---- Minecraft Crash Report ----
// On the bright side, I bought you a teddy bear!

Time: 9/28/13 1:58 PM
Description: Failed to start game

java.lang.StringIndexOutOfBoundsException: String index out of range: -1
at java.lang.String.substring(Unknown Source)
at drzhark.mocreatures.MoCProxy.parseName(MoCProxy.java:1276)
at drzhark.mocreatures.MoCProxy.initializeBiomes(MoCProxy.java:1228)
at drzhark.mocreatures.MoCProxy.ConfigPostInit(MoCProxy.java:612)
at drzhark.mocreatures.client.MoCClientProxy.ConfigPostInit(MoCClientProxy.java:735)
at drzhark.mocreatures.MoCreatures.postInit(MoCreatures.java:479)
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:494)
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:74)
at com.google.common.eventbus.SynchronizedEventHandler.handleEvent(SynchronizedEventHandler.java:45)
at com.google.common.eventbus.EventBus.dispatch(EventBus.java:314)
at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:296)
at com.google.common.eventbus.EventBus.post(EventBus.java:267)
at cpw.mods.fml.common.LoadController.sendEventToModContainer(LoadController.java:192)
at cpw.mods.fml.common.LoadController.propogateStateMessage(LoadController.java:172)
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:74)
at com.google.common.eventbus.SynchronizedEventHandler.handleEvent(SynchronizedEventHandler.java:45)
at com.google.common.eventbus.EventBus.dispatch(EventBus.java:314)
at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:296)
at com.google.common.eventbus.EventBus.post(EventBus.java:267)
at cpw.mods.fml.common.LoadController.distributeStateMessage(LoadController.java:103)
at cpw.mods.fml.common.Loader.initializeMods(Loader.java:696)
at cpw.mods.fml.client.FMLClientHandler.finishMinecraftLoading(FMLClientHandler.java:213)
at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:448)
at net.minecraft.client.MinecraftAppletImpl.func_71384_a(SourceFile:56)
at net.minecraft.client.Minecraft.run(Minecraft.java:733)
at java.lang.Thread.run(Unknown Source)


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

-- System Details --
Details:
Minecraft Version: 1.5.2
Operating System: Windows 7 (x86) version 6.1
Java Version: 1.7.0_40, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 373251928 bytes (355 MB) / 519110656 bytes (495 MB) up to 1037959168 bytes (989 MB)
JVM Flags: 2 total; -Xms512m -Xmx1024m
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 v7.51 FML v5.2.23.738 Minecraft Forge 7.8.1.738 21 mods loaded, 21 mods active
mcp{7.51} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
FML{5.2.23.738} [Forge Mod Loader] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
Forge{7.8.1.738} [Minecraft Forge] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
MB-Battlegear2-core{0.4.1} [Mine & Blade: Battlegear 2-core] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
CodeChickenCore{0.8.7.1} [CodeChicken Core] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
NotEnoughItems{1.5.2.28} [Not Enough Items] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
mod_bspkrsCore{v2.04(1.5.2)} [bspkrsCore] ([1.5.2]bspkrsCorev2.04.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
TreeCapitator{Forge 1.5.2.r01} [TreeCapitator] ([1.5.2]TreeCapitator.Forge.1.5.2.r01.Uni.CoreMod.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
GuiAPI{0.15.6} [GuiAPI] (GuiAPI-0.15.6-1.5.2.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
AsgardShield_Core{2.0.4} [AsgardShield] (1.5.2AsgardShield_Core_2.0.4Forge.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
ASAddon_ColorAPI{1.0.0} [ASAddon_ColorAPI] (1.5.2AsgardShield_Core_2.0.4Forge.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
DamageIndicatorsMod{2.6.4} [Damage Indicators] ([1.5.1]DamageIndicators v2.6.4.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
MB-Battlegear2{0.4.1} [Mine & Blade: Battlegear 2] ([1.5.2] Mine & Blade Battlegear 2 - Mod (0.4.1).jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
mod_ReiMinimap{v3.3_05 [1.5.2]} [mod_ReiMinimap] ([1.5.2]ReiMinimap_v3.3_05.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
Backpack{1.8.9} [Backpack] (backpack-1.8.9-1.5.2.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
BattleTowers{1.3.4} [Battle Towers] (BattleTowers_1.5.2.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
CustomSpawner{2.2.1} [DrZhark's CustomSpawner] (CustomMobSpawner 2.2.1.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
MoCreatures{5.2.2} [DrZhark's Mo'Creatures Mod] (DrZharks MoCreatures Mod v5.2.2.zip) Unloaded->Constructed->Pre-initialized->Initialized->Errored
InfernalMobs{1.3.1} [Infernal Mobs] (InfernalMobs_1.5.2.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
inventorytweaks{1.54b} [Inventory Tweaks] (InventoryTweaks-1.54b.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
AS_UpdateCheck{1.0.8} [AtomicStryker Update Check Mod] (UpdateCheckerMod_1.5.2.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized
LWJGL: 2.4.2
OpenGL: Intel(R) HD Graphics Family GL version 3.1.0 - Build 8.15.10.2769, Intel
Is Modded: Definitely; Client brand changed to 'fml,forge'
Type: Client (map_client.txt)
Texture Pack: Default
Profiler Position: N/A (disabled)
Vec3 Pool Size: ~~ERROR~~ NullPointerException: null

If you can help me, please answer back.

I know how to install mods. However, I'm not a pro and I really don't think I can answer the question. In the -System Details- It says a lot of the mod names so we know that it most likely has to do with the mods. It may just be the fact that you have so many. Or they conflicted.

Quote from RrreeedddstoneMiner

I know how to install mods. However, I'm not a pro and I really don't think I can answer the question. In the -System Details- It says a lot of the mod names so we know that it most likely has to do with the mods. It may just be the fact that you have so many. Or they conflicted.

Ummm, I think you're right, but they worked perfectly fine before I exited minecraft. So I really don't know what's happening. I re-installed a few and it still is crashing.

Also, I was changing my skin when it crashed.
If that means anything.

Quote from Crafterguy3x3

Are they all updated to the version you are using and are compatible with one another?

Yeah. I updated them to 1.5.2. I use a Windows XP computer and it's not good enough for 1.6.4, so I just stayed on 1.5.2.
They're all up to date, and so is Minecraft Forge.

If it also matters, I use some mod installers from Skydaz.
But the rest I install on my own.