So I installed several mods but when i try to install IC2 its crashing.
Following mods are installed:
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1.5.2
+Minecraft Forge(710) - 
+BuildCraft
+NEI[CORE]
+TreeCapitator[CORE]
+bspkrsCore
+CoFH Core[CORE]
+Code Chicken Core[CORE]
+Thermal Expansion
+InvTweaks
+Iron Chests
+Tinkers' Construct
+ExtrabiomesXL
+Applied Energistics
+Natura
+Better Dungeon Mod
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1.5.1
+Glaticraft[CORE] 
+IndustrialCraft
+Better Furnaces
+RailCraft
+Facorization
+Steve's Carts
+Power Crystals Core[CORE]
+Nether Ores
I looked up my problem here and found this post from blaster:
Quote from blaster1. Remove all mods except Forge and test. If you can load Forge without any problems, move to step 2
2. Re install your core mods. while you are testing, NEI is very helpful as it can show you any broken recepies and help with ID conflicts
3. Install in mods that go into the mods folder one at a time, in order to find out the mod that is causing the problem
Completed step 1 and 2, stucking in step 3. Installed core mods and tried to install IC2 afterwards. The result was a crash report.
Here is the crash report:
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---- Minecraft Crash Report ----
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// Hi. I'm Minecraft, and I'm a crashaholic.
Time: 10.07.13 21:01
Description: Failed to start game
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.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.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
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: 1.5.2
	Operating System: Windows 7 (x86) version 6.1
	Java Version: 1.7.0_21, Oracle Corporation
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
	Memory: 390324952 bytes (372 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 13 mods loaded, 13 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{0.8.7.3} [CodeChicken Core] (coremods) Unloaded->Constructed->Pre-initialized
	CoFHFramework{1.5.2.5} [CoFH Framework] (coremods) Unloaded->Constructed->Pre-initialized
	NotEnoughItems{1.5.2.28} [Not Enough Items] (coremods) Unloaded->Constructed->Pre-initialized
	PowerCrystalsCore{1.1.6} [PowerCrystals Core] (coremods) Unloaded->Constructed->Pre-initialized
	mod_bspkrsCore{v2.09(1.5.2)} [bspkrsCore] ([1.5.2]bspkrsCorev2.09.zip) Unloaded->Constructed->Pre-initialized
	TreeCapitator{Forge 1.5.2.r13} [TreeCapitator] ([1.5.2]TreeCapitator.Forge.1.5.2.r13.Uni.CoreMod.jar) Unloaded->Constructed->Pre-initialized
	CoFHCore{1.5.2.5} [CoFHCore] (CoFHCore-1.5.2.5 (1).jar) Unloaded->Constructed->Pre-initialized
	CoFHWorld{1.5.2.5} [CoFHWorld] (CoFHCore-1.5.2.5 (1).jar) Unloaded->Constructed->Pre-initialized
	GalacticraftCore{0.1.35} [Galacticraft Core] (Galacticraft-1.5.2-a0.1.35.239.jar) Unloaded->Constructed->Pre-initialized
	IC2{1.117.921} [IndustrialCraft 2] (industrialcraft-2_1.117.921.jar) Unloaded->Constructed->Errored
	LWJGL: 2.4.2
	OpenGL: GeForce G210M/PCIe/SSE2 GL version 3.3.0, NVIDIA Corporation
	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
I hope someone can help me.
Thanks in advance.