Moving an object

Hello, I'm trying to set my players position back to a certain point. here is my code.

var player : GameObject;

 Network.player.transform.position = GameObject.Find("Spawn").transform.position;

I set the "var player : GameObject;" to the player prefab but it gives me this error when I try to re-spawn

NullReferenceException: Object reference not set to an instance of an object

Boo.Lang.Runtime.RuntimeServices.GetDispatcher (System.Object target, System.String cacheKeyName, System.Type[] cacheKeyTypes, Boo.Lang.Runtime.DynamicDispatching.DispatcherFactory factory) Boo.Lang.Runtime.RuntimeServices.GetDispatcher (System.Object target, System.Object[] args, System.String cacheKeyName, Boo.Lang.Runtime.DynamicDispatching.DispatcherFactory factory) Boo.Lang.Runtime.RuntimeServices.GetProperty (System.Object target, System.String name) UnityScript.Lang.UnityRuntimeServices.GetProperty (System.Object target, System.String name) Instantiate.Die () (at Assets/Instantiate.js:19) if anyone knows whats going on please feel free to help. Thanks!