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This is the crash

---- Minecraft Crash Report ----
// You're mean.

Time: 9/29/13 6:25 AM
Description: Exception in server tick loop

java.lang.NoClassDefFoundError: net/minecraft/world/chunk/EmptyChunk
at net.minecraft.world.WorldServer.func_72970_h(WorldServer.java:730)
at net.minecraft.world.World.<init>(World.java:291)
at net.minecraft.world.WorldServer.<init>(WorldServer.java:112)
at WorldServerOF.<init>(WorldServerOF.java:30)
at net.minecraft.server.integrated.IntegratedServer.func_71247_a(IntegratedServer.java:55)
at net.minecraft.server.integrated.IntegratedServer.func_71197_b(IntegratedServer.java:142)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:445)
at net.minecraft.server.ThreadMinecraftServer.run(SourceFile:583)
Caused by: java.lang.ClassNotFoundException: net.minecraft.world.chunk.EmptyChunk
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:186)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 8 more
Caused by: java.lang.NullPointerException
at net.aetherteam.threadedlighting.asm.TLTransformer.transform(TLTransformer.java:103)
at net.minecraft.launchwrapper.LaunchClassLoader.runTransformers(LaunchClassLoader.java:274)
at net.minecraft.launchwrapper.LaunchClassLoader.findClass(LaunchClassLoader.java:172)
... 10 more


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

-- System Details --
Details:
Minecraft Version: 1.6.4
Operating System: Windows 8 (amd64) version 6.2
Java Version: 1.7.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 5994458400 bytes (5716 MB) / 6174015488 bytes (5888 MB) up to 6174015488 bytes (5888 MB)
JVM Flags: 4 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx6144m -Xmx6144m -Xms6144m
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 v8.11 FML v6.4.18.898 Minecraft Forge 9.11.0.898 Optifine OptiFine_1.6.4_HD_U_C4 18 mods loaded, 18 mods active
mcp{8.09} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
FML{6.4.18.898} [Forge Mod Loader] (minecraftforge-9.11.0.898.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
Forge{9.11.0.898} [Minecraft Forge] (minecraftforge-9.11.0.898.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
playercoreapi{0.1} [PlayerCoreAPI] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
threadedlighting{0.1} [Threaded Lighting] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
mod_bspkrsCore{v3.05(1.6.4)} [bspkrsCore] ([1.6.4]bspkrsCorev3.05.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
TreeCapitator{Forge 1.6.4.r02} [Treecapitator] ([1.6.4]TreeCapitator.Forge.1.6.4.r02.Universal.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
Aether II{Alpha v1.0.1} [Aether II] (aether.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
MainMenuAPI{1.0.0} [Main Menu API] (aether.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
BWG4{1.1.9} [Better World Generation 4] (BWG4_V119.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
craftguide{1.5.2} [CraftGuide] (CraftGuide-1.6.7.3.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
eplus{1.16.4} [Enchanting Plus] (EnchantingPlus-1.16.4.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
MCCapesExtra{1.6.4a} [MCCapes Extra] (MCCapesExtra_1.6.4a.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
SimpleRecipes{1.9} [Pam's Simple Recipes] (Pam's Simple Recipes 1.6.2.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
simpleores{1.1.0} [SimpleOres 2] (SimpleOres 2 + Plugins v1.1.0.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
simpleoresfusion{1.1.0} [SimpleOres 2 Fusion Plugin] (SimpleOres 2 + Plugins v1.1.0.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
stillhungry{2.0.0} [Still Hungry] (stillhungry-universal-2.0.0.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
weaponmod{1.6.2 v1.13.5} [Balkon's WeaponMod] (WeaponMod.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
Profiler Position: N/A (disabled)
Player Count: 0 / 8; []
Type: Integrated Server (map_client.txt)
Is Modded: Definitely; Client brand changed to 'fml,forge'