Particles not working

gistfile1.txt

	@SubscribeEvent
	public void onItemPickup(EntityItemPickupEvent event){
		if(event.entityLiving instanceof EntityPlayer){
			EntityPlayer player = (EntityPlayer)event.entityLiving;
			if(player.inventory.hasItem(NewItems.unstableVoidItem)){
				System.out.println(event.entityLiving.posX);
				double x = event.entityLiving.posX;
				double y = event.entityLiving.posY;
				double z = event.entityLiving.posZ;
				for(int i = 0; i <= 30; i++){
					event.entityPlayer.worldObj.spawnParticle("portal", x,y,z, 1D, 1D,1D);		
				}
				event.entity.setDead();
				event.setCanceled(true);
			}
		}
	}