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I need help with this I installed Galactic craft and it seems to crash even when I try to find out with which mods it conflicts with I still cant run it here in the report error I get : (I have reisminimap,buildcraft,computercraft,ICBM,IC2, and traincraft installed)
---- Minecraft Crash Report ----
// Shall we play a game?
Time: 3/29/13 6:17 PM
Description: Failed to start game
cpw.mods.fml.common.LoaderException: java.lang.NoClassDefFoundError: micdoodle8/mods/galacticraft/moon/entities/GCMoonPlayerBase
at cpw.mods.fml.common.LoadController.transition(LoadController.java:117)
at cpw.mods.fml.common.Loader.loadMods(Loader.java:487)
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.NoClassDefFoundError: micdoodle8/mods/galacticraft/moon/entities/GCMoonPlayerBase
at micdoodle8.mods.galacticraft.moon.GalacticraftMoon.preLoad(GalacticraftMoon.java:41)
at micdoodle8.mods.galacticraft.core.GalacticraftCore.preInit(GalacticraftCore.java:119)
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:485)
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: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:486)
... 5 more
Caused by: java.lang.ClassNotFoundException: micdoodle8.mods.galacticraft.moon.entities.GCMoonPlayerBase
at cpw.mods.fml.relauncher.RelaunchClassLoader.findClass(RelaunchClassLoader.java:185)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 32 more
Caused by: java.lang.NoClassDefFoundError: ServerPlayerBase
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:174)
... 34 more
Caused by: java.lang.ClassNotFoundException: ServerPlayerBase
at cpw.mods.fml.relauncher.RelaunchClassLoader.findClass(RelaunchClassLoader.java:89)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 38 more

A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------
-- System Details --
Details:
Minecraft Version: 1.4.7
Operating System: Windows 8 (amd64) version 6.2
Java Version: 1.7.0_17, Oracle Corporation
Java VM Version: Java HotSpot™ 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 476018240 bytes (453 MB) / 648740864 bytes (618 MB) up to 954466304 bytes (910 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 v7.26 FML v4.7.4.520 Minecraft Forge 6.6.0.497 17 mods loaded, 17 mods active
mcp [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized
FML [Forge Mod Loader] (coremods) Unloaded->Constructed->Pre-initialized
Forge [Minecraft Forge] (coremods) Unloaded->Constructed->Pre-initialized
mod_ReiMinimap [mod_ReiMinimap] ([1.4.7]ReiMinimap_v3.2_06.zip) Unloaded->Constructed->Pre-initialized
BuildCraft|Core [BuildCraft] (buildcraft-A-3.4.3.jar) Unloaded->Constructed->Pre-initialized
BuildCraft|Builders [BC Builders] (buildcraft-A-3.4.3.jar) Unloaded->Constructed->Pre-initialized
BuildCraft|Energy [BC Energy] (buildcraft-A-3.4.3.jar) Unloaded->Constructed->Pre-initialized
BuildCraft|Factory [BC Factory] (buildcraft-A-3.4.3.jar) Unloaded->Constructed->Pre-initialized
BuildCraft|Transport [BC Transport] (buildcraft-A-3.4.3.jar) Unloaded->Constructed->Pre-initialized
BuildCraft|Silicon [BC Silicon] (buildcraft-A-3.4.3.jar) Unloaded->Constructed->Pre-initialized
ComputerCraft [ComputerCraft] (ComputerCraft1.5.zip) Unloaded->Constructed->Pre-initialized
CCTurtle [ComputerCraft Turtles] (ComputerCraft1.5.zip) Unloaded->Constructed->Pre-initialized
GalacticraftCore [Galacticraft Core] (Galacticraft-Alpha-0.0.7.zip) Unloaded->Constructed->Errored
ICBM|Explosion [ICBM|Explosion] (ICBM_Explosion_v1.0.6.168.jar) Unloaded->Constructed->Pre-initialized
IC2 [IndustrialCraft 2] (industrialcraft-2_1.112.170-lf.jar) Unloaded->Constructed->Pre-initialized
ModularForceFieldSystem [Modular ForceField System V2] (ModularForceFieldSystemV2.2.8.3.6.zip) Unloaded->Constructed->Pre-initialized
TC [Traincraft] (Traincraft-3.1.13_030.jar) Unloaded->Constructed->Pre-initialized
LWJGL: 2.4.2
OpenGL: Intel® HD Graphics 3000 GL version 3.1.0 - Build 9.17.10.2828, Intel
Is Modded: Definitely; Client brand changed to 'forge,fml'
Type: Client (map_client.txt)
Texture Pack: AI_Pack.zip
Profiler Position: N/A (disabled)
Vec3 Pool Size: ~~ERROR~~ NullPointerException: null

did you try and remove the other mods.

Try disabling/removing each mod one at a time, until it finally works... then the last one you removed is likely the culprit it's conflicting with.