putnpc2 problem

[Chompy]

PHP Code:

public function dropItem(id)
{
  temp.n = "object_item";

  with(findplayer("Chompy")) {
    with(putnpc2(30, 30, "this.join(\"" @ n @ "\" );")) {
      ...
    }
  }
} 


I'm doing this from a weapon npc..
Any reason why this won't work?

Or do I have to change the npcs array (with(npcs[npcs.size() - 1]))?

Or is there any other methods?