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i got this error report here:


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\Christine\AppData\Roaming\.minecraft\crash-reports\crash-2013-02-02_11.56.04-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 2c7ceb62 --------
Full report at:
C:\Users\Christine\AppData\Roaming\.minecraft\crash-reports\crash-2013-02-02_11.56.04-client.txt
Please show that file to Mojang, NOT just this screen!

Generated 2/2/13 11:56 AM

-- System Details --
Details:
Minecraft Version: 1.4.7
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.6.0_18, Sun Microsystems Inc.
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Sun Microsystems Inc.
Memory: 271756800 bytes (259 MB) / 479526912 bytes (457 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 22 mods loaded, 22 mods active
mcp [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized
FML [Forge Mod Loader] (coremods) Unloaded->Constructed->Pre-initialized->Initialized
Forge [Minecraft Forge] (coremods) Unloaded->Constructed->Pre-initialized->Initialized
GuiAPI [GuiAPI] (GuiAPI-0.15.2-1.4.6.jar) Unloaded->Constructed->Pre-initialized->Initialized
XtraBlocksEE [XtraBlocksEE] (1.4.7_XtraBlocksEE v3.9.7c.zip) Unloaded->Constructed->Pre-initialized->Initialized
XtraXtras [XtraXtras] (1.4.7_XtraBlocksEE v3.9.7c.zip) Unloaded->Constructed->Pre-initialized->Initialized
BuildCraft|Core [BuildCraft] (buildcraft-A-3.4.0.jar) Unloaded->Constructed->Pre-initialized->Initialized
BuildCraft|Builders [BC Builders] (buildcraft-A-3.4.0.jar) Unloaded->Constructed->Pre-initialized->Initialized
BuildCraft|Energy [BC Energy] (buildcraft-A-3.4.0.jar) Unloaded->Constructed->Pre-initialized->Initialized
BuildCraft|Factory [BC Factory] (buildcraft-A-3.4.0.jar) Unloaded->Constructed->Pre-initialized->Initialized
BuildCraft|Transport [BC Transport] (buildcraft-A-3.4.0.jar) Unloaded->Constructed->Pre-initialized->Initialized
BuildCraft|Silicon [BC Silicon] (buildcraft-A-3.4.0.jar) Unloaded->Constructed->Pre-initialized->Initialized
CustomSpawner [DrZhark's CustomSpawner] (CustomMobSpawner 1.11.zip) Unloaded->Constructed->Pre-initialized->Initialized
DragonMounts [Dragon Mounts (WIP)] (dragonmount_v0.91_mc1.4.6_forge.zip) Unloaded->Constructed->Pre-initialized->Initialized
MoCreatures [DrZhark's Mo'Creatures Mod] (DrZharks MoCreatures Mod v4.5.1.zip) Unloaded->Constructed->Pre-initialized->Initialized
SlimevoidLib [Slimevoid Library] (SlimevoidLib_2.0.1.1.zip) Unloaded->Constructed->Pre-initialized->Initialized
DynamicElevators [Dynamic Elevators] (DynamicElevators-2.0.0.4.zip) Unloaded->Constructed->Pre-initialized->Initialized
PortalGun [Portal Gun] (PortalGun1.4.7v2.zip) Unloaded->Constructed->Pre-initialized->Errored
Railcraft [Railcraft] (Railcraft_1.4.7-6.14.0.0.zip) Unloaded->Constructed->Pre-initialized->Initialized
mod_RecipeBook [mod_RecipeBook] (Recipe Book.zip) Unloaded->Constructed->Pre-initialized->Initialized
mod_shutter [mod_shutter] (shutter146ml1.zip) Unloaded->Constructed->Pre-initialized->Initialized
Thaumcraft [Thaumcraft] (Thaumcraft3.0.2.zip) Unloaded->Constructed->Pre-initialized->Initialized
LWJGL: 2.4.2
OpenGL: ATI Radeon HD 5450 GL version 3.2.9232, ATI Technologies Inc.
Is Modded: Definitely; Client brand changed to 'forge,fml'
Type: Client (map_client.txt)
Texture Pack: Dowsey's Faithful 32x.zip
Profiler Position: N/A (disabled)
Vec3 Pool Size: ~~ERROR~~ NullPointerException: null

java.lang.IllegalArgumentException: Slot 1100 is already occupied by [email protected] when adding [email protected]
at amq.<init>(Block.java:326)
at amq.<init>(Block.java:359)
at akb.<init>(BlockContainer.java:17)
at portalgun.common.block.BlockPortalMod.<init>(BlockPortalMod.java:28)
at portalgun.common.core.CommonProxy.initModPart(CommonProxy.java:166)
at portalgun.common.core.CommonProxy.initModParts(CommonProxy.java:149)
at portalgun.common.PortalGun.load(PortalGun.java:169)
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.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: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.initializeMods(Loader.java:657)
at cpw.mods.fml.client.FMLClientHandler.finishMinecraftLoading(FMLClientHandler.java:207)
at net.minecraft.client.Minecraft.a(Minecraft.java:456)
at asq.a(SourceFile:56)
at net.minecraft.client.Minecraft.run(Minecraft.java:744)
at java.lang.Thread.run(Unknown Source)
--- END ERROR REPORT 8c9eb371 ----------

WHAT DOES IT MEAANNNN?

You have an item id conflict with portalgun and xtraxmas. you can fix it by editing the item id for one of the 2 mods by going to the config folder inside of .minecraft and changing one of those item ids to a unused id.