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i just've installed forge and the amputation mod, then this happens:


--- BEGIN ERROR REPORT ba2beefd --------
Full report at:
C:\Users\ACER\AppData\Roaming\.minecraft\crash-reports\crash-2013-01-01_11.53.15-server.txt
Please show that file to Mojang, NOT just this screen!

Generated 1/1/13 11:53 AM

-- Head --
Stacktrace:
at yc.a(World.java:1662)
at lq.d(Entity.java:734)
at md.e(EntityLiving.java:1524)
at md.c(EntityLiving.java:1822)
at qj.c(SourceFile:26)
at qn.c(SourceFile:141)
at md.j_(EntityLiving.java:806)
at qj.j_(SourceFile:31)
at yc.a(World.java:2295)
at in.a(WorldServer.java:645)
at yc.g(World.java:2257)

-- Entity being ticked --
Details:
Entity Type: Skeleton (qn)
Entity ID: 23243
Name: Skeleton
Exact location: -23.50, 37.00, -19.50
Block location: World: (-24,37,-20), Chunk: (at 8,2,12 in -2,-2; contains blocks -32,0,-32 to -17,255,-17), Region: (-1,-1; contains chunks -32,-32 to -1,-1, blocks -512,0,-512 to -1,255,-1)
Momentum: 0.00, -0.08, 0.00
Stacktrace:
at yc.h(World.java:2103)
at in.h(WorldServer.java:514)

-- Affected level --
Details:
Level name: Creativezinga
All players: 1 total; [iq['Jundi'/179, l='Creativezinga', x=46.01, y=63.00, z=-38.32]]
Chunk stats: ServerChunkCache: 719 Drop: 0
Level seed: 6158255472569486447
Level generator: ID 00 - default, ver 1. Features enabled: true
Level generator options:
Level spawn location: World: (204,64,32), Chunk: (at 12,4,0 in 12,2; contains blocks 192,0,32 to 207,255,47), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 7926 game time, 7926 day time
Level dimension: 0
Level storage version: 0x04ABD - Anvil
Level weather: Rain time: 10185 (now: false), thunder time: 101722 (now: false)
Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: true
Stacktrace:
at net.minecraft.server.MinecraftServer.r(MinecraftServer.java:679)
at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:598)
at bdz.q(IntegratedServer.java:159)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:497)
at fy.run(SourceFile:849)

-- System Details --
Details:
Minecraft Version: 1.4.6
Operating System: Windows 7 (x86) version 6.1
Java Version: 1.7.0_10-ea, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 116466328 bytes (111 MB) / 519110656 bytes (495 MB) up to 1037959168 bytes (989 MB)
JVM Flags: 2 total; -Xms512m -Xmx1024m
AABB Pool Size: 4002 (224112 bytes; 0 MB) allocated, 2566 (143696 bytes; 0 MB) used
Suspicious classes: FML and Forge are installed
IntCache: cache: 0, tcache: 0, allocated: 3, tallocated: 63
FML: MCP v7.25 FML v4.6.12.511 Minecraft Forge 6.5.0.471 Optifine OptiFine_1.4.6_HD_U_A3 4 mods loaded, 4 mods active
mcp [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
FML [Forge Mod Loader] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
Forge [Minecraft Forge] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
mod_Gibbing [mod_Gibbing] (MobAmputation1.4.6v1.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available
Profiler Position: N/A (disabled)
Vec3 Pool Size: 1322 (74032 bytes; 0 MB) allocated, 420 (23520 bytes; 0 MB) used
Player Count: 1 / 8; [iq['Jundi'/179, l='Creativezinga', x=46.01, y=63.00, z=-38.32]]
Type: Integrated Server (map_client.txt)
Is Modded: Definitely; Client brand changed to 'forge,fml'

java.lang.NullPointerException
at yc.a(World.java:1662)
at lq.d(Entity.java:734)
at md.e(EntityLiving.java:1524)
at md.c(EntityLiving.java:1822)
at qj.c(SourceFile:26)
at qn.c(SourceFile:141)
at md.j_(EntityLiving.java:806)
at qj.j_(SourceFile:31)
at yc.a(World.java:2295)
at in.a(WorldServer.java:645)
at yc.g(World.java:2257)
at yc.h(World.java:2103)
at in.h(WorldServer.java:514)
at net.minecraft.server.MinecraftServer.r(MinecraftServer.java:679)
at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:598)
at bdz.q(IntegratedServer.java:159)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:497)
at fy.run(SourceFile:849)
--- END ERROR REPORT 60bbc676 ----------


can somebody tell me why and how to fix it?

Sometimes I have this error before.I usually force update and then I installed it in a clean Minecraft.Jar.It worked for me though.