Trying to generate mushrooms

[TheSmiler]

Hello, am just beginning modding and I am trying to generate new mushrooms with the GeneratorBushFeature(BlockBush) class.

The game is starting but chash when I try to generate a world.

My mushroom block extends the BlockMushroom class and my generator class is registered with GameRegistry.registerWorldGenerator(new WorldGenMushrooms(),0);

 

here is the generator's cod:

 

package fr.thesmiler.mushroomsmod.world.gen.feature;

 

import java.util.Random;

 

import net.minecraft.util.BlockPos;

import net.minecraft.world.World;

import net.minecraft.world.chunk.IChunkProvider;

import net.minecraft.world.gen.GeneratorBushFeature;

import net.minecraft.world.gen.feature.WorldGenerator;

import net.minecraftforge.fml.common.IWorldGenerator;

import net.minecraftforge.fml.relauncher.Side;

import net.minecraftforge.fml.relauncher.SideOnly;

import fr.thesmiler.mushroomsmod.init.MushroomsBlocks;

 

public class WorldGenMushrooms implements IWorldGenerator{

 

public WorldGenerator mushroomYellowGen;

public Random randomGenerator;

public BlockPos bp;

 

public WorldGenMushrooms(){

        this.mushroomYellowGen = new GeneratorBushFeature(MushroomsBlocks.yellow_mushroom);

        System.out.println("TEST");

}

 

@Override

public void generate(Random random, int chunkX, int chunkZ, World world, IChunkProvider chunkGenerator, IChunkProvider chunkProvider){

 

generateSurfaceMush(world, random, chunkX*16, chunkZ*16);

 

if(world.provider.getDimensionId()==0){

 

generateSurfaceMush(world, random, chunkX*16, chunkZ*16);

}

 

 

 

 

}

 

 

public void generateSurfaceMush(World world, Random rand, int chunkX, int chunkZ){

 

 

 

    for (int i = 0; i < 50; i++){

   

    if (this.randomGenerator.nextInt(4) == 0){

 

    int randPosX = chunkX + rand.nextInt(16);

    int randPosY = rand.nextInt(48);

    int randPosZ = chunkZ + rand.nextInt(16);

           

    BlockPos blockpos2 = world.getHorizon(bp.add(randPosX, randPosY, randPosZ));

    mushroomYellowGen.generate(world, rand,blockpos2);

    System.out.println("test");

       

    }

   

   

    }

}

}

 

I did removed the comments because they were in Frensh, sorry.

 

Please help me!

[Failender]

I bet its an NPE on bp..