When I added this mod in, it crashed. I have no clue why. I even removed NEI....
Sorry it's so long, the spoilers weren't working for me.
---- Minecraft Crash Report ----
// Sorry 
Time: 12/27/12 9:08 PM
Description: Failed to start game
cpw.mods.fml.common.LoaderException: java.lang.ClassNotFoundException: immibis.ars.ARSMod
at cpw.mods.fml.common.LoadController.transition(LoadController.java:117)
at cpw.mods.fml.common.Loader.loadMods(Loader.java:484)
at cpw.mods.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:161)
at net.minecraft.client.Minecraft.a(Minecraft.java:410)
at asq.a(SourceFile:56)
at net.minecraft.client.Minecraft.run(Minecraft.java:744)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.ClassNotFoundException: immibis.ars.ARSMod
at cpw.mods.fml.relauncher.RelaunchClassLoader.findClass(RelaunchClassLoader.java:179)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at cpw.mods.fml.common.ModClassLoader.loadClass(ModClassLoader.java:57)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at cpw.mods.fml.common.FMLModContainer.constructMod(FMLModContainer.java:414)
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.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.loadMods(Loader.java:478)
... 5 more
Caused by: java.lang.NoClassDefFoundError: immibis/core/api/net/IPacketMap
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at cpw.mods.fml.relauncher.RelaunchClassLoader.findClass(RelaunchClassLoader.java:172)
... 32 more
Caused by: java.lang.ClassNotFoundException: immibis.core.api.net.IPacketMap
at cpw.mods.fml.relauncher.RelaunchClassLoader.findClass(RelaunchClassLoader.java:87)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 36 more
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_09, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 396638400 bytes (378 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 v7.25 FML v4.6.15.514 Minecraft Forge 6.5.0.487 Optifine OptiFine_1.4.6_HD_U_A2 57 mods loaded, 57 mods active
mcp [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed
FML [Forge Mod Loader] (coremods) Unloaded->Constructed
Forge [Minecraft Forge] (coremods) Unloaded->Constructed
mod_CodeChickenCore [CodeChicken Core] (coremods) Unloaded->Constructed
TreeCapitator [TreeCapitator] ([1.4.6]TreeCapitator.Forge.1.4.6.r01.Uni.CoreMod.jar) Unloaded->Constructed
campfire [The campfire mod] ([1.4.6]Campfire Mod universal[0.8.4].zip) Unloaded->Constructed
mod_ReiMinimap [mod_ReiMinimap] ([1.4.6]ReiMinimap_v3.2_05.zip) Unloaded->Constructed
BuildCraft|Core [BuildCraft] (buildcraft-A-3.3.0.jar) Unloaded->Constructed
BuildCraft|Factory [BC Factory] (buildcraft-A-3.3.0.jar) Unloaded->Constructed
BuildCraft|Transport [BC Transport] (buildcraft-A-3.3.0.jar) Unloaded->Constructed
BuildCraft|Silicon [BC Silicon] (buildcraft-A-3.3.0.jar) Unloaded->Constructed
APUnofficial [Additional Pipes Unofficial] (AdditionalPipes-2.1.3u36-1.4.6-beta.jar) Unloaded->Constructed
ImmibisCore [Immibis Core] (immibis-core-52.0.2.jar) Unloaded->Errored
IC2 [IndustrialCraft 2] (industrialcraft-2_1.112.170-lf.jar) Unloaded->Constructed
AdvancedRepulsionSystems [Advanced Repulsion Systems] (adv-repulsion-systems-52.0.2.jar) Unloaded->Errored
AdvancedMachines [IC2 Advanced Machines Addon] (AdvancedMachines_1.4.6.zip) Unloaded->Constructed
Backpack [Backpack] (backpack-1.5.4-1.4.6.zip) Unloaded->Constructed
BuildCraft|Energy [BC Energy] (buildcraft-A-3.3.0.jar) Unloaded->Constructed
BCIC2Crossover [BC-IC2 Crossover Mod] (BCIC2crossover 2.0.zip) Unloaded->Constructed
BuildCraft|Builders [BC Builders] (buildcraft-A-3.3.0.jar) Unloaded->Constructed
ChestTransporter [Chest Transporter] (chestTransporter_1.1.3_Universal.zip) Unloaded->Constructed
ColoredBricks [Colored Bricks] (ColoredBricks_1.4.6_v1.0.3.zip) Unloaded->Constructed
CompactSolars [Compact Solar Arrays] (compactsolars-universal-1.4.6-3.2.0.21.zip) Unloaded->Constructed
ComputerCraft [ComputerCraft] (ComputerCraft1.481.zip) Unloaded->Constructed
CCTurtle [ComputerCraft Turtles] (ComputerCraft1.481.zip) Unloaded->Constructed
CTIII [CTIII] (CraftingTableIII_1.4.6_test4.zip) Unloaded->Constructed
denLib [denLib] (denLib-2.1.0.jar) Unloaded->Constructed
EE3 [Equivalent Exchange 3] (ee3-universal-pre1e.jar) Unloaded->Constructed
EnderStorage [EnderStorage] (EnderStorage 1.3.1.0.jar) Unloaded->Constructed
BinnieCore [Binnie Core] (extrabees-1.4.9.3-prerelease.zip) Unloaded->Constructed
ExtraBees [Extra Bees] (extrabees-1.4.9.3-prerelease.zip) Unloaded->Constructed
Forestry [Forestry for Minecraft] (forestry-A-1.6.4.1.jar) Unloaded->Constructed
HangableMaps [Hangable Maps] (HangableMaps_v1.4.6_1_MC1.4.6.zip) Unloaded->Constructed
IC2BackpackHUD [IC2 Backpack HUD] (IC2 Backpack HUD - v2.2 - MC-1.4.6.zip) Unloaded->Constructed
IC2NuclearControl [Nuclear Control] (IC2NuclearControl-1.4.5) Unloaded->Constructed
mod_InvTweaks [Inventory Tweaks] (InventoryTweaks_1.46.zip) Unloaded->Constructed
IronChest [Iron Chest] (ironchest-universal-1.4.6-4.5.1.199.zip) Unloaded->Constructed
MoarAchForge [Moar Achievements Redux] (MoarAchievementsV113.zip) Unloaded->Constructed
GraviSuite [Gravitation Suite] (mod_zGraviSuite_1_6.zip) Unloaded->Constructed
MorePistons [More Pistons] (More Pistons 1.1.1 for [1.4.6].zip) Unloaded->Constructed
NetherOres [Nether Ores] (NetherOres_1.4.6.zip) Unloaded->Constructed
Railcraft [Railcraft] (Railcraft_1.4.6-6.12.2.0.zip) Unloaded->Constructed
RedPowerCore [RedPower] (RedPowerCore-2.0pr6.zip) Unloaded->Constructed
RedPowerBase [RP Base] (RedPowerCore-2.0pr6.zip) Unloaded->Constructed
RedPowerMachine [RP Machine] (RedPowerMechanical-2.0pr6.zip) Unloaded->Constructed
RedPowerCompat [RP Compat] (RedPowerCompat-2.0pr6.zip) Unloaded->Constructed
RedPowerWiring [RP Wiring] (RedPowerDigital-2.0pr6.zip) Unloaded->Constructed
RedPowerLogic [RP Logic] (RedPowerDigital-2.0pr6.zip) Unloaded->Constructed
RedPowerLighting [RP Lighting] (RedPowerDigital-2.0pr6.zip) Unloaded->Constructed
RedPowerWorld [RP World] (RedPowerMechanical-2.0pr6.zip) Unloaded->Constructed
RedPowerControl [RP Control] (RedPowerMechanical-2.0pr6.zip) Unloaded->Constructed
IC2.SeedManager [SeedManager] (SeedManager-3.0.3-universal.zip) Unloaded->Constructed
mod_SpawnerGUI [mod_SpawnerGUI] (Spawner GUI.zip) Unloaded->Constructed
UsefulFood [UsefulFood] (usefulfood_v1.2.3-universal.zip) Unloaded->Constructed
WR-CBE|Core [WR-CBE Core] (WR-CBE Core 1.3.2.jar) Unloaded->Constructed
WR-CBE|Addons [WR-CBE Addons] (WR-CBE Addons 1.3.2.jar) Unloaded->Constructed
WR-CBE|RedPower [WR-CBE RedPower] (WR-CBE RedPower 1.3.2.jar) Unloaded->Constructed
LWJGL: 2.4.2
OpenGL: GeForce 7300 SE/7200 GS/PCIe/SSE2 GL version 2.1.2, NVIDIA Corporation
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
