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

Time: 05.05.13 17:57
Description: Exception in server tick loop

java.lang.NullPointerException
at net.minecraft.world.World.getBlockMaterial(World.java:592)
at net.minecraft.world.gen.feature.WorldGenDungeons.generate(WorldGenDungeons.java:36)
at net.minecraft.world.gen.ChunkProviderGenerate.populate(ChunkProviderGenerate.java:571)
at net.minecraft.world.gen.ChunkProviderServer.populate(ChunkProviderServer.java:258)
at net.minecraft.world.chunk.Chunk.populateChunk(Chunk.java:1249)
at net.minecraft.world.gen.ChunkProviderServer.loadChunk(ChunkProviderServer.java:153)
at net.minecraft.server.MinecraftServer.initialWorldChunkLoad(MinecraftServer.java:281)
at net.minecraft.server.integrated.IntegratedServer.loadAllWorlds(IntegratedServer.java:88)
at net.minecraft.server.integrated.IntegratedServer.startServer(IntegratedServer.java:105)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:429)
at net.minecraft.server.ThreadMinecraftServer.run(ThreadMinecraftServer.java:16)


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 8 (x86) version 6.2
Java Version: 1.7.0_21, Oracle Corporation
Java VM Version: Java HotSpot™ Client VM (mixed mode), Oracle Corporation
Memory: 831363896 bytes (792 MB) / 1037959168 bytes (989 MB) up to 1037959168 bytes (989 MB)
JVM Flags: 3 total; -Xincgc -Xmx1024M -Xms1024M
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: 3, tallocated: 63
FML: MCP v7.44 FML v5.1.16.640 Minecraft Forge 7.7.1.640 4 mods loaded, 4 mods active
mcp [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
FML [Forge Mod Loader] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
Forge [Minecraft Forge] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
sleepmod [Spellflex Building Pack Sleep pre-ALPHA] (bin) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
Profiler Position: N/A (disabled)
Vec3 Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Player Count: 0 / 8; []
Type: Integrated Server (map_client.txt)
Is Modded: Definitely; Client brand changed to 'fml,forge'

public static BiomeGenBase biomeSleep;

biomeSleep = (new biomeSleep(25)).setBiomeName("biomeSleep").setDisableRain().setTemperatureRainfall(2.0F, 0.0F).setMinMaxHeight(0.1F, 0.2F);
GameRegistry.addBiome(biomeSleep);

import net.minecraft.world.biome.BiomeGenBase;

public class biomeSleep extends BiomeGenBase
{
public biomeSleep(int par1)
{
super(par1);
this.topBlock = (byte)sleepmod.stonebrickred.blockID;
this.fillerBlock = (byte)sleepmod.stonebrickred.blockID;

}

}