---- Minecraft Crash Report ----
// On the bright side, I bought you a teddy bear!

Time: 5/2/13 3:56 PM
Description: Failed to start game

java.lang.IllegalArgumentException: duplicate key: mod_a
	at com.google.common.base.Preconditions.checkArgument(Preconditions.java:119)
	at com.google.common.collect.RegularImmutableMap.<init>(RegularImmutableMap.java:67)
	at com.google.common.collect.ImmutableMap$Builder.fromEntryList(ImmutableMap.java:249)
	at com.google.common.collect.ImmutableMap$Builder.build(ImmutableMap.java:235)
	at com.google.common.collect.Maps.uniqueIndex(Maps.java:1168)
	at com.google.common.collect.Maps.uniqueIndex(Maps.java:1142)
	at cpw.mods.fml.common.Loader.identifyMods(Loader.java:349)
	at cpw.mods.fml.common.Loader.loadMods(Loader.java:479)
	at cpw.mods.fml.client.FMLClientHandler.beginMinecraftLoading(FMLClientHandler.java:160)
	at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:407)
	at net.minecraft.client.MinecraftAppletImpl.func_71384_a(SourceFile:56)
	at net.minecraft.client.Minecraft.run(Minecraft.java:729)
	at java.lang.Thread.run(Thread.java:722)


A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- System Details --
Details:
	Minecraft Version: 1.5.1
	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: 423490144 bytes (403 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 v7.44 FML v5.1.29.662 Minecraft Forge 7.7.1.662 Optifine OptiFine_1.5.1_HD_D1 9 mods loaded, 0 mods active
	mcp{7.44} [Minecraft Coder Pack] (minecraft.jar)
	FML{5.1.29.662} [Forge Mod Loader] (coremods)
	Forge{7.7.1.662} [Minecraft Forge] (coremods)
	mod_rubyFurnace{Not available} [mod_rubyFurnace] (MOD.zip)
	mod_rubyGem{Not available} [mod_rubyGem] (MOD.zip)
	mod_rubyOre{Not available} [mod_rubyOre] (MOD.zip)
	mod_rubySword{Not available} [mod_rubySword] (MOD.zip)
	mod_a{Not available} [mod_a] (MOD.zip)
	mod_a{Not available} [mod_a] (MOD.zip)
	LWJGL: 2.4.2
	OpenGL: GeForce GTX 660 Ti/PCIe/SSE2 GL version 4.3.0, NVIDIA Corporation
	Is Modded: Definitely; Client brand changed to 'fml,forge'
	Type: Client (map_client.txt)
	Texture Pack: Main-Texture.zip
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: ~~ERROR~~ NullPointerException: null