BlockPopulator can't use Block functions

I am making a custom world gen plugin, but don't know how to add to it if I can't even use BlockPopulator successfully. I am running spigot 1.14.3, not sure if that effects anything. It's not like it doesn't work, I just can't load the world outright. Without the blockpopulator it does fine.

maingeneratorcode (open) maingeneratorcode (close)

Code:

public class MainGenerator extends ChunkGenerator{
    int currentHeight = 60;
    @Override
    public ChunkData generateChunkData(World world, Random random, int chunkX, int chunkZ, BiomeGrid biome) {
        SimplexOctaveGenerator generator = new SimplexOctaveGenerator(new Random(world.getSeed()), 8);
        ChunkData chunk = createChunkData(world);
        generator.setScale(0.005D);

        for (int X = 0; X < 16; X++)
            for (int Z = 0; Z < 16; Z++) {
                currentHeight = (int) (generator.noise(chunkX*16+X, chunkZ*16+Z, 0.5D, 0.5D)*15D+50D);
                chunk.setBlock(X, currentHeight, Z, Material.SAND);
                chunk.setBlock(X, currentHeight-1, Z, Material.SANDSTONE);
                for (int i = currentHeight-2; i > 0; i--)
                    chunk.setBlock(X, i, Z, Material.STONE);
                chunk.setBlock(X, 0, Z, Material.BEDROCK);
            }
        return chunk;
    }
    @Override
    public List<BlockPopulator> getDefaultPopulators(World world) {
        return Arrays.asList(new DeadBushPopulator());
    }
}

And before you ask, I do have getDefaultWorldGenerator set in Main

blockpopulatorcode (open) blockpopulatorcode (close)

Code:

public class DeadBushPopulator extends BlockPopulator {
    @Override
    public void populate(World world, Random random, Chunk chunk) {
        int cX = chunk.getX() * 16;
        int cY = chunk.getZ() * 16;
        int cZOff = cX + random.nextInt(15);
        int cXOff = cY + random.nextInt(15);
        new Location(world, cXOff, world.getHighestBlockYAt(cXOff, cZOff)+1, cZOff).getBlock().setType(Material.DEAD_BUSH);
    }
}