Switch level script problem

alright so i have a switch level script. it was working fine but then i started getting these

NullReferenceException: Object reference not set to an instance of an object Boo.Lang.Runtime.RuntimeServices.Dispatch (System.Object target, System.String cacheKeyName, System.Type[] cacheKeyTypes, System.Object[] args, Boo.Lang.Runtime.DynamicDispatching.DispatcherFactory factory) Boo.Lang.Runtime.RuntimeServices.Dispatch (System.Object target, System.String cacheKeyName, System.Object[] args, Boo.Lang.Runtime.DynamicDispatching.DispatcherFactory factory) Boo.Lang.Runtime.RuntimeServices.SetProperty (System.Object target, System.String name, System.Object value) Display GUI Script.Update () (at Assets/Misc Scripts/Display GUI Script.js:10)

errors.

this is the script i use:

 var target : Transform;
 
 function Update () {
     var other = gameObject.GetComponent("GUI Style Script");
 
     if ( Vector3.Distance(target.position, transform.position ) < 25) {
         other.enabled = true;
     }
     if ( Vector3.Distance(target.position, transform.position ) > 25) {
         other.enabled = false;
     }
 }
 
 

this script is used along with this script:

 var level2load : int;
 function OnGUI () {
 
     // Make a background box
 
     GUI.Box (Rect (10,10,300,90), "Do You Want To Go To the Next Level?");
 
 
 
     // Make the first button. If it is pressed, Application.Loadlevel (1) will be executed
 
     if (GUI.Button (Rect (130,40,80,20), "Yeah")) {
         Application.LoadLevel(level2load);
     }
 }

i'm pretty sure the code wants to make my life miserable. =(