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I use many mods and after recently installing IC2 my Minecraft crashes on startup, can someone tell me why I'm getting this error and how to fix it?

	  Minecraft has crashed!	 
	  ----------------------	 
Minecraft has stopped running because it encountered a problem; Failed to start game
A full error report has been saved to C:\Users\Toy for Robert\AppData\Roaming\.minecraft\crash-reports\crash-2013-07-01_13.55.46-client.txt - Please include a copy of that file (Not this screen!) if you report this crash to anyone; without it, they will not be able to help fix the crash 
--- BEGIN ERROR REPORT 7ff29f81 --------
Full report at:
C:\Users\Toy for Robert\AppData\Roaming\.minecraft\crash-reports\crash-2013-07-01_13.55.46-client.txt
Please show that file to Mojang, NOT just this screen!
Generated 7/1/13 1:55 PM
-- System Details --
Details:
Minecraft Version: 1.5.2
Operating System: Windows 7 (x86) version 6.1
Java Version: 1.7.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 389163128 bytes (371 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 19 mods loaded, 19 mods active
mcp{7.51} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized
FML{5.2.23.738} [Forge Mod Loader] (coremods) Unloaded->Constructed->Pre-initialized
Forge{7.8.1.738} [Minecraft Forge] (coremods) Unloaded->Constructed->Pre-initialized
CodeChickenCore{0.8.7} [CodeChicken Core] (coremods) Unloaded->Constructed->Pre-initialized
Backpack{1.9.11} [Backpack] (minecraft.jar) Unloaded->Constructed->Pre-initialized
AnObsidianPlate{1.0} [An Obsidian Plate] (AnObsidianPlate-v1.1.zip) Unloaded->Constructed->Pre-initialized
ArsMagica{5.52.013} [Ars Magica] (ArsMagica_5.52.013.zip) Unloaded->Constructed->Pre-initialized
BuildCraft|Core{3.6.0} [BuildCraft] (buildcraft-A-3.6.0.jar) Unloaded->Constructed->Pre-initialized
BuildCraft|Builders{3.6.0} [BC Builders] (buildcraft-A-3.6.0.jar) Unloaded->Constructed->Pre-initialized
BuildCraft|Energy{3.6.0} [BC Energy] (buildcraft-A-3.6.0.jar) Unloaded->Constructed->Pre-initialized
BuildCraft|Factory{3.6.0} [BC Factory] (buildcraft-A-3.6.0.jar) Unloaded->Constructed->Pre-initialized
BuildCraft|Transport{3.6.0} [BC Transport] (buildcraft-A-3.6.0.jar) Unloaded->Constructed->Pre-initialized
BuildCraft|Silicon{3.6.0} [BC Silicon] (buildcraft-A-3.6.0.jar) Unloaded->Constructed->Pre-initialized
EE3{pre1h (build 16)} [Equivalent Exchange 3] (ee3-universal-pre1h-16.jar) Unloaded->Constructed->Pre-initialized
Forestry{2.2.2.2} [Forestry for Minecraft] (ForestryMod1.5.2.jar) Unloaded->Constructed->Pre-initialized
hudplus{0.9.1} [Hud+] (hudPlus.zip) Unloaded->Constructed->Pre-initialized
IC2{1.116.919} [IndustrialCraft 2] (industrialcraft-2_1.116.919.jar) Unloaded->Constructed->Errored
Railcraft{7.0.0.0} [Railcraft] (Railcraft_1.5.1-7.0.0.0.jar) Unloaded->Constructed->Pre-initialized
mod_ZanMinimap{0.9.4} [mod_ZanMinimap] (ZansMinimap1.5.2.zip) Unloaded->Constructed->Pre-initialized
LWJGL: 2.4.2
OpenGL: ATI Mobility Radeon HD 4200 GL version 2.1.8787, ATI Technologies Inc.
Is Modded: Definitely; Client brand changed to 'fml,forge'
Type: Client (map_client.txt)
Texture Pack: Custom Monkeyfarm Texture.zip
Profiler Position: N/A (disabled)
Vec3 Pool Size: ~~ERROR~~ NullPointerException: null
cpw.mods.fml.common.LoaderException: java.lang.NoSuchFieldError: manager
at cpw.mods.fml.common.LoadController.transition(LoadController.java:147)
at cpw.mods.fml.common.Loader.loadMods(Loader.java:516)
at cpw.mods.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:163)
at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:411)
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)
Caused by: java.lang.NoSuchFieldError: manager
at ic2.core.IC2.load(IC2.java:818)
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.GeneratedMethodAccessor4.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.loadMods(Loader.java:515)
... 5 more
--- END ERROR REPORT ae643c62 ----------