[1.7.10] custom dimension

hello guys,

I am trying to make a custom dimension.

But the dimension generates exactly like the nether whatever I do.

I have been 1 time in my "real" dimension.

I have changed my code back to that but I can't really reach it anymore.

Here are my codes:

@EventHandler
public void init(FMLInitializationEvent event){
	RPGEvents.registerEvents();
	RPGentities.registerEntities();
	RPGTileEntities.registerTileEntities();
	RecipeHandler.load();
	proxy.registerRenderThings();
	proxy.registerKeyBindings();
	GameRegistry.registerWorldGenerator(new RPGGenerator(), 1);
	dimensionId = DimensionManager.getNextFreeDimId();
	DimensionManager.registerProviderType(dimensionId, Generator.class, true);
	DimensionManager.registerDimension(dimensionId, dimensionId);
}

public class Generator extends WorldProvider {

@Override
public String getDimensionName() {
	return "Dark World";
}

public int getAverageGroundLevel(){
	return 10;
}

public boolean canRespawnHere(){
	return true;
}

public IChunkProvider createChunkGenerator(){
	return new DarkChunkGenerator(worldObj);
}
}

public class DarkChunkGenerator implements IChunkProvider {

public World world;

public DarkChunkGenerator(World worldObj){
	world = worldObj;
}

@Override
public boolean chunkExists(int x, int z) {
	return false;
}

@Override
public Chunk provideChunk(int x, int z) {
	Chunk chunk = new Chunk(world, x, z);
	return chunk;
}

@Override
public Chunk loadChunk(int x, int z) {
	return null;
}

@Override
public void populate(IChunkProvider provider, int x, int z) {
}

@Override
public boolean saveChunks(boolean b, IProgressUpdate update) {
	return true;
}

@Override
public boolean unloadQueuedChunks() {
	return false;
}

@Override
public boolean canSave() {
	return true;
}

@Override
public String makeString() {
	return "dark world ";
}

@Override
public List getPossibleCreatures(EnumCreatureType creatureType, int x, int y, int z) {
	return null;
}

@Override
public ChunkPosition func_147416_a(World world, String string, int x, int y, int z) {
	return null;
}

@Override
public int getLoadedChunkCount() {
	return 10;
}

@Override
public void recreateStructures(int x, int z) {
}

@Override
public void saveExtraData() {
}

}

public class RPGGenerator implements IWorldGenerator{

@Override
public void generate(Random random, int chunkX, int chunkZ, World world, IChunkProvider chunkGenerator, IChunkProvider chunkProvider) {
	int randomX = chunkX * 16 + random.nextInt(16);
	int randomZ = chunkZ * 16 + random.nextInt(16);
	int y = BlockFeatures.getHighestBlock(world, randomX, randomZ);
	int randomizer = random.nextInt(400);
	if(randomizer == 50 && y >= 0 && world.provider.dimensionId == 0){
		RPGBuildings.makeHouse(world, randomX, y, randomZ, randomX + random.nextInt(48) + 16, y + random.nextInt(10) + 10, randomZ + random.nextInt(20) + 10, Blocks.brick_block, Blocks.planks);
	}
	if(world.provider.dimensionId == KnokkoRPG.dimensionId){
		System.out.println("IWorldGenerator is called!");
		world.setBlock(0, 100, 0, Blocks.obsidian);
	}
}
}

IWorldGenerator is really spamming in the console but doesn't place any obsidian...

This is how I travel to my dimension:

public class TestItem extends Item {
public ItemStack onItemRightClick(ItemStack item, World world, EntityPlayer player){
	player.swingItem();
	player.travelToDimension(KnokkoRPG.dimensionId);
	return item;
}
}