Build error : cannot find symbol on World.spawnEntityInWorld

Hello,

I'm trying to make an item that shoots blaze fireballs, here's the code :

@Override
			public ActionResult<ItemStack> onItemRightClick(World world, EntityPlayer entity, EnumHand hand) {
				ActionResult<ItemStack> retval = super.onItemRightClick(world, entity, hand);
				if(world.isRemote)
					return retval;
				ItemStack itemstack = retval.getResult();
				Vec3d looking = entity.getLookVec();
				EntitySmallFireball fireball = new EntitySmallFireball(world, (EntityLivingBase) entity,
					looking.x * 0.4, looking.y * 0.4, looking.z * 0.4);
				world.spawnEntityInWorld((Entity) fireball);
				return retval;
			}

And here's the error :

error: cannot find symbol
            world.spawnEntityInWorld((Entity) fireball);
                 ^
  symbol:   method spawnEntityInWorld(Entity)
  location: variable world of type World

I searched a lot but found nothing, any idea ?