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my game crashes when i try and spawn the wither here is the crash report

i have no idea how to read this


---- Minecraft Crash Report ----
// Why is it breaking

Time: 7/7/13 11:12 AM
Description: Exception in server tick loop

java.lang.NoSuchMethodError: net.minecraft.entity.boss.EntityWither.func_70667_aM()F
at net.minecraft.entity.boss.EntityWither.<init>(EntityWither.java:48)
at net.minecraft.block.BlockSkull.func_82529_a(BlockSkull.java:263)
at net.minecraft.item.ItemSkull.func_77648_a(SourceFile:63)
at net.minecraft.item.ItemStack.func_77943_a(ItemStack.java:152)
at net.minecraft.item.ItemInWorldManager.func_73078_a(ItemInWorldManager.java:429)
at net.minecraft.network.NetServerHandler.func_72472_a(NetServerHandler.java:572)
at net.minecraft.network.packet.Packet15Place.func_73279_a(SourceFile:58)
at net.minecraft.network.MemoryConnection.func_74428_b(MemoryConnection.java:89)
at net.minecraft.network.NetServerHandler.func_72570_d(NetServerHandler.java:139)
at net.minecraft.network.NetworkListenThread.func_71747_b(NetworkListenThread.java:54)
at net.minecraft.server.integrated.IntegratedServerListenThread.func_71747_b(IntegratedServerListenThread.java:109)
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:689)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:585)
at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:129)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:482)
at net.minecraft.server.ThreadMinecraftServer.run(SourceFile:582)


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

-- System Details --
Details:
Minecraft Version: 1.6.1
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.6.0_29, Sun Microsystems Inc.
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Sun Microsystems Inc.
Memory: 319828864 bytes (305 MB) / 648282112 bytes (618 MB) up to 954466304 bytes (910 MB)
JVM Flags: 1 total; -Xmx1G
AABB Pool Size: 4655 (260680 bytes; 0 MB) allocated, 4326 (242256 bytes; 0 MB) used
Suspicious classes: FML and Forge are installed
IntCache: cache: 0, tcache: 0, allocated: 3, tallocated: 63
FML: MCP v8.02 FML v6.1.27.762 Minecraft Forge 8.9.0.762 10 mods loaded, 10 mods active
mcp{7.51} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
FML{6.1.27.762} [Forge Mod Loader] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Forge{8.9.0.762} [Minecraft Forge] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
mod_bspkrsCore{v3.01(1.6.1)} [bspkrsCore] ([1.6.1]bspkrsCorev3.01.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
TreeCapitator{Forge 1.6.1.r01} [TreeCapitator] ([1.6.1]TreeCapitator.Forge.1.6.1.r01.Uni.CoreMod.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
DamageIndicatorsMod{2.8.2.0} [Damage Indicators] (1.6.1 DamageIndicators v2.8.2.0.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
DungeonPack{1.6.1 v1} [DungeonPack] (DungeonPack 1.6.1 v1.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
integerArray_gildedtools{2.0.0 for 1.6.1} [Gilded Tools Mod] (Gilded Tools (MC 1.6).zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
integerarray_torchbow{1.1.0 for 1.6.1} [Torchbow Mod] (Torchbow 1.1 (MC 1.6).zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
mod_ZanMinimap{0.9.4} [mod_ZanMinimap] (ZansMinimap1.6.1.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Profiler Position: N/A (disabled)
Vec3 Pool Size: 2809 (157304 bytes; 0 MB) allocated, 1551 (86856 bytes; 0 MB) used
Player Count: 1 / 8; [EntityPlayerMP['ToMoToMo21'/207, l='New Worldtrsjhgfn', x=-16.45, y=69.88, z=-1697.60]]
Type: Integrated Server (map_client.txt)
Is Modded: Definitely; Client brand changed to 'fml,forge'