Natura 1.2.12 CrashReport

---- Minecraft Crash Report ----
// Everything's going to plan. No, really, that was supposed to happen.

Time: 4/2/13 6:40 PM
Description: Failed to start game

java.lang.IllegalArgumentException: duplicate key: Natura
	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(Unknown Source)


A detailed walkthrough of the error, its code path and all known details is as follows:
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-- System Details --
Details:
	Minecraft Version: 1.5.1
	Operating System: Windows 7 (x86) version 6.1
	Java Version: 1.7.0_09, Oracle Corporation
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
	Memory: 454037736 bytes (433 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 v5.1.13.624 Minecraft Forge 7.7.1.624 6 mods loaded, 0 mods active
	mcp [Minecraft Coder Pack] (minecraft.jar)
	FML [Forge Mod Loader] (coremods)
	Forge [Minecraft Forge] (coremods)
	Natura [Natura] (Natura_1.5.1_2.0.1.1.zip)
	Natura [Natura] (Natura_1.5.1_2.0.1.1.zip)
	TConstruct [Tinkers; Construct] (TConstruct_1.5.1_1.2.12.zip)
	LWJGL: 2.4.2
	OpenGL: ATI Radeon HD 3200 Graphics GL version 3.3.10750 Compatibility Profile Context, ATI Technologies Inc.
	Is Modded: Definitely; Client brand changed to 'fml,forge'
	Type: Client (map_client.txt)
	Texture Pack: Default
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: ~~ERROR~~ NullPointerException: null