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So I was downloading some mods to join my friends server and all of a sudden this guy pops up, help would be great

Minecraft has crashed!
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Minecraft has stopped running because it encountered a problem; Failed to start game
This error has been saved to C:\Users\Wesley\AppData\Roaming\.minecraft\crash-reports\crash-2013-07-08_19.21.56-client.txt for your convenience. Please include a copy of this file if you report this crash to anyone.



--- BEGIN ERROR REPORT 1651224b --------
Generated 08/07/13 7:21 PM

- Minecraft Version: 1.4.2
- Operating System: Windows 8 (x86) version 6.2
- Java Version: 1.7.0_25, Oracle Corporation
- Java VM Version: Java HotSpot™ Client VM (mixed mode), Oracle Corporation
- Memory: 374351160 bytes (357 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
- FML: MCP v7.19 FML v4.2.18.433 Minecraft Forge 6.0.1.355 14 mods loaded, 14 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
mod_AnimalBikes [mod_AnimalBikes] (AnimalBikes 1.4.2 v0.5 Modloader.zip) Unloaded->Constructed->Pre-initialized->Initialized
Backpack [Backpack] (backpack-1.5.4-1.4.2.zip) Unloaded->Constructed->Pre-initialized->Initialized
CampCraft [CampCraftMod] (CampCraft 1.4.2v3.3.zip) Unloaded->Constructed->Pre-initialized->Initialized
MoCreatures [DrZhark's Mo'Creatures Mod] (DrZhark's Mo'Creatures Mod v4.1.3.zip) Unloaded->Constructed->Pre-initialized->Initialized
ExtrabiomesXL [ExtrabiomesXL] (ExtrabiomesXL-universal-3.3.0.jar) Unloaded->Constructed->Pre-initialized->Initialized
LegendaryBeasts [Legendary Beasts] (Forge_LegendaryBeastsAlpha1.4.2.0.zip) Unloaded->Constructed->Pre-initialized->Initialized
PortalGun [PortalGun] (portalgun1.4.2v0.3_universal.zip) Unloaded->Constructed->Pre-initialized->Errored
teeluk_SpecialArmor [SpecialArmor] (SpecialArmor_1.4.2b.zip) Unloaded->Constructed->Pre-initialized->Initialized
pitman-87_TF2_Teleporter [TF2 Teleporter] (TF2_Teleporter_1.4.2a.zip) Unloaded->Constructed->Pre-initialized->Initialized
TwilightForest [The Twilight Forest] (twilightforest-1.12.3.zip) Unloaded->Constructed->Pre-initialized->Initialized
UsefulFood [UsefulFood] (usefulfood-1.4.2_v1.2.0-universal.zip) Unloaded->Constructed->Pre-initialized->Initialized
- LWJGL: 2.4.2
- OpenGL: GeForce 610/PCIe/SSE2 GL version 4.2.0, NVIDIA Corporation
- Is Modded: Definitely; 'forge,fml'
- Type: Client
- Texture Pack: Default
- Profiler Position: N/A (disabled)
- Vec3 Pool Size: ~ERROR~ NullPointerException: null

java.lang.IllegalArgumentException: Slot 204 is already occupied by [email protected] when adding [email protected]
at alf.<init>(Block.java:292)
at alf.<init>(Block.java:325)
at aiq.<init>(BlockContainer.java:13)
at portalgun.common.block.BlockPortalMod.<init>(BlockPortalMod.java:17)
at portalgun.common.core.CommonProxy.initModPart(CommonProxy.java:106)
at portalgun.common.core.CommonProxy.initModParts(CommonProxy.java:87)
at portalgun.common.PortalGun.load(PortalGun.java:165)
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:440)
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.initializeMods(Loader.java:651)
at cpw.mods.fml.client.FMLClientHandler.finishMinecraftLoading(FMLClientHandler.java:196)
at net.minecraft.client.Minecraft.a(Minecraft.java:465)
at net.minecraft.client.Minecraft.run(Minecraft.java:752)
at java.lang.Thread.run(Unknown Source)
--- END ERROR REPORT 8467ca97 ----------