I Crash Upon Entering a World

---- Minecraft Crash Report ----
// This is a token for 1 free hug. Redeem at your nearest Mojangsta: [~~HUG~~]

Time: 04/07/13 3:50 PM
Description: Ticking entity

java.lang.NoSuchMethodError: net.minecraftforge.common.ForgeHooks.isLivingOnLadder(Lnet/minecraft/block/Block;Lnet/minecraft/world/World;IIILnet/minecraft/entity/EntityLiving;)Z
	at net.minecraft.entity.EntityLiving.func_70617_f_(EntityLiving.java:1637)
	at net.minecraft.entity.EntityLiving.func_70612_e(EntityLiving.java:1547)
	at net.minecraft.entity.EntityLiving.func_70636_d(EntityLiving.java:1883)
	at net.minecraft.entity.EntityAgeable.func_70636_d(SourceFile:82)
	at net.minecraft.entity.passive.EntityAnimal.func_70636_d(SourceFile:30)
	at net.minecraft.entity.passive.EntitySheep.func_70636_d(EntitySheep.java:94)
	at net.minecraft.entity.EntityLiving.func_70071_h_(EntityLiving.java:864)
	at net.minecraft.world.World.func_72866_a(World.java:2337)
	at net.minecraft.world.WorldServer.func_72866_a(WorldServer.java:717)
	at net.minecraft.world.World.func_72870_g(World.java:2299)
	at net.minecraft.world.World.func_72939_s(World.java:2145)
	at net.minecraft.world.WorldServer.func_72939_s(WorldServer.java:546)
	at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:652)
	at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:571)
	at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:127)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:469)
	at net.minecraft.server.ThreadMinecraftServer.run(gp.java:35)


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

-- Head --
Stacktrace:
	at net.minecraft.entity.EntityLiving.func_70617_f_(EntityLiving.java:1637)
	at net.minecraft.entity.EntityLiving.func_70612_e(EntityLiving.java:1547)
	at net.minecraft.entity.EntityLiving.func_70636_d(EntityLiving.java:1883)
	at net.minecraft.entity.EntityAgeable.func_70636_d(SourceFile:82)
	at net.minecraft.entity.passive.EntityAnimal.func_70636_d(SourceFile:30)
	at net.minecraft.entity.passive.EntitySheep.func_70636_d(EntitySheep.java:94)
	at net.minecraft.entity.EntityLiving.func_70071_h_(EntityLiving.java:864)
	at net.minecraft.world.World.func_72866_a(World.java:2337)
	at net.minecraft.world.WorldServer.func_72866_a(WorldServer.java:717)
	at net.minecraft.world.World.func_72870_g(World.java:2299)

-- Entity being ticked --
Details:
	Entity Type: Sheep (net.minecraft.entity.passive.EntitySheep)
	Entity ID: 0
	Entity Name: Sheep
	Entity's Exact location: -410.50, 68.00, 260.50
	Entity's Block location: World: (-411,68,260), Chunk: (at 5,4,4 in -26,16; contains blocks -416,0,256 to -401,255,271), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
	Entity's Momentum: 0.00, 0.00, 0.00
Stacktrace:
	at net.minecraft.world.World.func_72939_s(World.java:2145)
	at net.minecraft.world.WorldServer.func_72939_s(WorldServer.java:546)

-- Affected level --
Details:
	Level name: Rabbit Hunt By, Toxic_Herobrine
	All players: 0 total; []
	Chunk stats: ServerChunkCache: 625 Drop: 0
	Level seed: -1821959325
	Level generator: ID 00 - default, ver 1. Features enabled: true
	Level generator options: 
	Level spawn location: World: (-244,64,256), Chunk: (at 12,4,0 in -16,16; contains blocks -256,0,256 to -241,255,271), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
	Level time: 1 game time, 1 day time
	Level dimension: 0
	Level storage version: 0x04ABD - Anvil
	Level weather: Rain time: 151381 (now: false), thunder time: 128329 (now: false)
	Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: true
Stacktrace:
	at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:652)
	at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:571)
	at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:127)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:469)
	at net.minecraft.server.ThreadMinecraftServer.run(gp.java:35)

-- System Details --
Details:
	Minecraft Version: 1.5.2
	Operating System: Windows 7 (x86) version 6.1
	Java Version: 1.7.0_25, Oracle Corporation
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode, sharing), Oracle Corporation
	Memory: 317170888 bytes (302 MB) / 518979584 bytes (494 MB) up to 518979584 bytes (494 MB)
	JVM Flags: 2 total; -Xms512m -Xmx512m
	AABB Pool Size: 5 (280 bytes; 0 MB) allocated, 5 (280 bytes; 0 MB) used
	Suspicious classes: FML and Forge are installed
	IntCache: cache: 0, tcache: 0, allocated: 3, tallocated: 63
	FML: MCP v7.51 FML v5.2.2.684 Minecraft Forge 7.8.0.684 7 mods loaded, 7 mods active
	mcp{7.44} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
	FML{5.2.2.684} [Forge Mod Loader] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
	Forge{7.8.0.684} [Minecraft Forge] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
	NBTEdit{1.5.2.0} [In-game NBTEdit] (Forge_NBTEditv1.5.2.0.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
	mod_ClosetSkinChanger{Closet Block 1.5.2 [V 2.2]} [mod_ClosetSkinChanger] (Closet Mod.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
	Chisel{1.4.4} [Chisel] (Chisel-Mod-1.5.2.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
	mod_TooManyItems{1.5.2 2013-04-25} [mod_TooManyItems] (TooManyItems2013_04_25_1.5.2.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 1 (56 bytes; 0 MB) allocated, 1 (56 bytes; 0 MB) used
	Player Count: 0 / 8; []
	Type: Integrated Server (map_client.txt)
	Is Modded: Definitely; Client brand changed to 'fml,forge'