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I get this huge error upon starting minecraft and i have not a clue how to fix it while being able to keep my mods. the last thing i downloaded that this happened to was forge. if anyone can help thatd be great.
Thank you


Minecraft has crashed!
----------------------

Minecraft has stopped running because it encountered a problem; Failed to start game
This error has been saved to C:\Users\Sean\AppData\Roaming\.minecraft\crash-reports\crash-2012-10-08_15.40.55-client.txt for your convenience. Please include a copy of this file if you report this crash to anyone.



--- BEGIN ERROR REPORT 9f5cb73e --------
Generated 10/8/12 3:40 PM

- Minecraft Version: 1.3.2
- Operating System: Windows 7 (x86) version 6.1
- Java Version: 1.6.0_31, Sun Microsystems Inc.
- Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Sun Microsystems Inc.
- Memory: 397376048 bytes (378 MB) / 519110656 bytes (495 MB) up to 1037959168 bytes (989 MB)
- JVM Flags: 2 total; -Xms512m -Xmx1024m
- FML: FML v3.1.35.394 Minecraft Forge 4.2.5.303 5 mods loaded, 5 mods active
FML [Forge Mod Loader] (coremods) Unloaded->Constructed
Forge [Minecraft Forge] (coremods) Unloaded->Constructed
mod_TooManyItems [mod_TooManyItems] (minecraft.jar) Unloaded->Constructed
mod_CreepyPastaCraft [mod_CreepyPastaCraft] (minecraft.jar) Unloaded->Errored
colossali_SpiderMan [Spider Man Mod] (minecraft.jar) Unloaded->Constructed
- LWJGL: 2.4.2
- OpenGL: Intel(R) HD Graphics GL version 3.1.0 - Build 8.15.10.2696, Intel
- Is Modded: Definitely; 'forge,fml'
- Type: Client
- Texture Pack: Default
- Profiler Position: N/A (disabled)

cpw.mods.fml.common.LoaderException: java.lang.ClassNotFoundException: mod_CreepyPastaCraft
at cpw.mods.fml.common.LoadController.transition(LoadController.java:102)
at cpw.mods.fml.common.Loader.loadMods(Loader.java:467)
at cpw.mods.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:146)
at net.minecraft.client.Minecraft.a(Minecraft.java:416)
at net.minecraft.client.Minecraft.run(Minecraft.java:748)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.ClassNotFoundException: mod_CreepyPastaCraft
at cpw.mods.fml.relauncher.RelaunchClassLoader.findClass(RelaunchClassLoader.java:125)
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.ModClassLoader.loadBaseModClass(ModClassLoader.java:87)
at cpw.mods.fml.common.modloader.ModLoaderModContainer.constructMod(ModLoaderModContainer.java:488)
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:124)
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:81)
at cpw.mods.fml.common.Loader.loadMods(Loader.java:466)
... 4 more
Caused by: java.lang.NullPointerException
at org.objectweb.asm.ClassReader.<init>(Unknown Source)
at cpw.mods.fml.common.asm.transformers.AccessTransformer.transform(AccessTransformer.java:151)
at cpw.mods.fml.relauncher.RelaunchClassLoader.runTransformers(RelaunchClassLoader.java:162)
at cpw.mods.fml.relauncher.RelaunchClassLoader.findClass(RelaunchClassLoader.java:118)
... 32 more
--- END ERROR REPORT b216fdb1 ----------

Quote from Kovu

You'll have to force update, (options, force update)., and install each mod one by one (starting with Forge), until it crashes, at that point you can assume that they are not compatible.

Also, you cannot install Forge and ModLoader at the same time, and ModLoader mods will not work on Forge.

how do i know which are for mod loader or not?
thank you for the reply very helpful