place block problem

package com.tomasforsman.letseat.items.utility;

import com.tomasforsman.letseat.Logger;
import com.tomasforsman.letseat.init.ModBlocks;
import com.tomasforsman.letseat.items.ItemBase;

import net.minecraft.block.Block;
import net.minecraft.block.state.IBlockState;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.tileentity.TileEntity;
import net.minecraft.util.EnumActionResult;
import net.minecraft.util.EnumFacing;
import net.minecraft.util.EnumHand;
import net.minecraft.util.math.BlockPos;
import net.minecraft.world.World;

public class MergeWand extends ItemBase {

    public MergeWand(String name) {
        super(name);
    }

    @Override
    public EnumActionResult onItemUse(final EntityPlayer playerIn, final World worldIn, final BlockPos pos, final EnumHand hand, final EnumFacing facing, final float hitX, final float hitY, final float hitZ) {
            final IBlockState iBlockState = worldIn.getBlockState(pos);
            final IBlockState state = iBlockState.getActualState(worldIn, pos);
            Logger.info("Block at %d,%d,%d: %s", pos.getX(), pos.getY(), pos.getZ(), state);
            final BlockPos addPos = pos.up();

            final TileEntity tileEntity = worldIn.getTileEntity(pos);
            if (tileEntity != null) {
                Logger.info("TileEntity data: %s", tileEntity.serializeNBT());
                if (state.getBlock().isReplaceable(worldIn, addPos)) {
                    Block blk = ModBlocks.RUBY_BLOCK;
                    IBlockState blkState = blk.getDefaultState();
                    worldIn.setBlockState(addPos, blkState);
                    System.out.println("hello");


                }
            }
            return EnumActionResult.SUCCESS;
    }

}