What Minecraft version? What Forge version? When are you getting this? We need more info.

im sorry ive been tryin to fix this issue for so many hours im like on brink of passing out hah... well im using MC 1.7.10, forge version is forge-1.7.10-10.13.1.1217-universal.. im getting the error when chunk loading.. anything else you need to know please dont hesitate to ask! thank you so much for the reply, and good luck on solving this one! my friends and I usually figure out the issues on our own everytime, and we have gotten very proficient! we have encountered so many issues with modding minecraft, its become second nature almost.. but this one... this one is a stumper man.. it doesnt give us any real reason for chunk loading issues.. it only talks about worldgen... so we tried to just start a new world and took down all of our bc machines, ic2, steam, glenns gases, liq xp.. you name it we had it.. tore it all down to put onto ME drive in a bunch of storage cells, and transfer to a new world.. and when we get there all kinds of crazy stuff happened...all of our inventory was converted into different item types.. so finally i figured out that the level.dat had all the item ids stored on it.. moved old worlds level.dat into new world and boom! the grass blocks were turned into molten silinigil(wrong spelling im sure..) and there were DNA combiners in it, and all sorts of other crazyness.. anyways its been a very long and tedious night/morning/day of trying to get some good results.. and so far nothing.. so please please help! we will be forever grateful!

Post your actual FML log.

This seems to be an error somewhere in the structure generation.

 

I seem to be having a similar problem

[[19:10:06] [main/INFO]: Setting user: Player825
[19:10:11] [Client thread/INFO]: LWJGL Version: 2.9.1
[19:10:27] [Client thread/INFO]: Reloading ResourceManager: Default, FMLFileResourcePack:Forge Mod Loader, FMLFileResourcePack:Minecraft Forge, FMLFileResourcePack:MoreHorror
[19:10:29] [sound Library Loader/INFO]: Sound engine started
[19:10:36] [Client thread/INFO]: Created: 512x256 textures/blocks-atlas
[19:10:37] [Client thread/INFO]: Created: 512x256 textures/items-atlas
[19:10:37] [Client thread/INFO]: Reloading ResourceManager: Default, FMLFileResourcePack:Forge Mod Loader, FMLFileResourcePack:Minecraft Forge, FMLFileResourcePack:MoreHorror
[19:10:38] [Client thread/INFO]: Created: 512x256 textures/items-atlas
[19:10:38] [Client thread/INFO]: Created: 512x256 textures/blocks-atlas
[19:10:39] [sound Library Loader/INFO]: Sound engine started
[19:10:48] [Client thread/INFO]: Deleting level New World
[19:10:48] [Client thread/INFO]: Attempt 1...
[19:10:49] [Client thread/INFO]: Deleting level JOSH
[19:10:49] [Client thread/INFO]: Attempt 1...
[19:10:55] [server thread/INFO]: Starting integrated minecraft server version 1.7.10
[19:10:55] [server thread/INFO]: Generating keypair
[19:10:56] [server thread/INFO]: Converting map!
[19:10:56] [server thread/INFO]: Scanning folders...
[19:10:56] [server thread/INFO]: Total conversion count is 0
[19:10:58] [server thread/INFO]: Preparing start region for level 0
[19:10:59] [server thread/INFO]: Preparing spawn area: 3%
[19:11:00] [server thread/ERROR]: Encountered an unexpected exception
java.lang.NullPointerException
at net.minecraft.world.chunk.storage.ExtendedBlockStorage.func_150818_a(ExtendedBlockStorage.java:96) ~[ExtendedBlockStorage.class:?]
at net.minecraft.world.chunk.Chunk.func_150807_a(Chunk.java:667) ~[Chunk.class:?]
at net.minecraft.world.World.setBlock(World.java:515) ~[World.class:?]
at net.minecraft.world.gen.feature.WorldGenMinable.generate(WorldGenMinable.java:79) ~[WorldGenMinable.class:?]
at net.morehorror.mod.world.MoreHorrorWorldGen.addOreSpawn(MoreHorrorWorldGen.java:58) ~[MoreHorrorWorldGen.class:?]
at net.morehorror.mod.world.MoreHorrorWorldGen.generateOverworld(MoreHorrorWorldGen.java:33) ~[MoreHorrorWorldGen.class:?]
at net.morehorror.mod.world.MoreHorrorWorldGen.generate(MoreHorrorWorldGen.java:19) ~[MoreHorrorWorldGen.class:?]
at cpw.mods.fml.common.registry.GameRegistry.generateWorld(GameRegistry.java:106) ~[GameRegistry.class:?]
at net.minecraft.world.gen.ChunkProviderServer.populate(ChunkProviderServer.java:316) ~[ChunkProviderServer.class:?]
at net.minecraft.world.chunk.Chunk.populateChunk(Chunk.java:1163) ~[Chunk.class:?]
at net.minecraft.world.gen.ChunkProviderServer.originalLoadChunk(ChunkProviderServer.java:210) ~[ChunkProviderServer.class:?]
at net.minecraft.world.gen.ChunkProviderServer.loadChunk(ChunkProviderServer.java:151) ~[ChunkProviderServer.class:?]
at net.minecraft.world.gen.ChunkProviderServer.loadChunk(ChunkProviderServer.java:121) ~[ChunkProviderServer.class:?]
at net.minecraft.server.MinecraftServer.initialWorldChunkLoad(MinecraftServer.java:315) ~[MinecraftServer.class:?]
at net.minecraft.server.integrated.IntegratedServer.loadAllWorlds(IntegratedServer.java:79) ~[integratedServer.class:?]
at net.minecraft.server.integrated.IntegratedServer.startServer(IntegratedServer.java:96) ~[integratedServer.class:?]
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:455) [MinecraftServer.class:?]
at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:762) [MinecraftServer$2.class:?]
[19:11:00] [server thread/ERROR]: This crash report has been saved to: C:\Documents and Settings\Administrator\Desktop\Modding\MoreHorror 1.7.10\eclipse\.\crash-reports\crash-2014-10-14_19.11.00-server.txt

/////////////////////////////////////////////////////////////////////////////////////////////////////
WorldGenClass:
[code][package net.morehorror.mod.world;
import java.util.Random;

import net.morehorror.mod.MoreHorror;
import net.minecraft.block.Block;
import net.minecraft.init.Blocks;
import net.minecraft.world.World;
import net.minecraft.world.biome.BiomeGenBase;
import net.minecraft.world.chunk.IChunkProvider;
import net.minecraft.world.gen.feature.WorldGenMinable;
import cpw.mods.fml.common.IWorldGenerator;

public class MoreHorrorWorldGen implements IWorldGenerator{

//cases for the ore generation in the other dimensions
@Override
    public void generate(Random random, int chunkX, int chunkZ, World world, IChunkProvider chunkGenerator, IChunkProvider chunkProvider) {
        switch (world.provider.dimensionId) {
            case 0: generateOverworld(random, chunkX * 16, chunkZ * 16, world); break;
            case 1: generateEnd(random, chunkX * 16, chunkZ * 16, world); break;
            case -1: generateNether(random, chunkX * 16, chunkZ * 16, world); break;
        }
    }


    private void generateOverworld(Random random, int x, int z, World world) {
	//Adds to ore spawning algorithm
	//i = x block pos. x = block z pos, max x, max z , max vein, chance to spawn, minimum y, max y
  //this.addOreSpawn(MoreHorror.oreBloodOre, world, random, x, z, 16, 16, 2+random.nextInt(5)/*spawns randomly in veins 3 to 5*/, 25/* 25% chance*/, 0, 40/*No lower than 0 but no higher than 50*/);
	//this.addOreSpawn(MoreHorror.oreEvilOre, world, random, x, z, 16, 16, 3+random.nextInt(5), 35, 0, 60);
	//this.addOreSpawn(MoreHorror.blockBloodCrystal, world, random, x, z, 16, 16, 1+random.nextInt(1), 20, 0, 50);
	//this.addOreSpawn(MoreHorror.oreIntrawnOre, world, random, x, z, 16, 16, 1+random.nextInt(, 50, 0, 80);
	this.addOreSpawn(MoreHorror.oreBloodOre, world, random, x, z, 10, 15, 5, 0, 128);
	//BiomeGenBase biome = world.getWorldChunkManager().getBiomeGenAt(x, z);
	//WAIT ON THIS TILL FURTHER THINGS
	//if((biome == BiomeGenBase.plains)){
		//for(int a = 0;a < 1; a++){
			//int i = x + random.nextInt(256);
			//int k = z + random.nextInt(256);
			//int j = world.getHeightValue(i, k);

			//new StructureHelpMe().generate(world, random, i, j, k);

		//}
	//}
}



public void addOreSpawn(Block block, World world, Random random, int blockXPos, int blockZPos, int minVeinSize, int maxVeinSize, int chancesToSpawn, int minY, int maxY )
    {
        WorldGenMinable minable = new WorldGenMinable(block, (minVeinSize + random.nextInt(maxVeinSize - minVeinSize)), Blocks.stone);
        for(int i = 0; i < chancesToSpawn; i++)
        {
            int posX = blockXPos + random.nextInt(16);
            int posY = minY + random.nextInt(maxY - minY);
            int posZ = blockZPos + random.nextInt(16);
            minable.generate(world, random, posX, posY, posZ);
        }
    }

//////////////////////////////////////////////////////////////////////////////
private void generateEnd(Random random, int i, int x, World world) {
	// TODO Auto-generated method stub

}
/////////////////////////////////////////////////////////////////////////////
private void generateNether(Random random, int i, int x, World world) {
	// TODO Auto-generated method stub

}

}
]