¿Score system with the new UI?

Hello there, I'm trying to do is: When the player colliding with the GOLD COIN, add 150 points to a text of the new UI and displayed on the screen. I saw that this could be done in a tutorial Unity video official, but as I did not understand, and I get an error. GOLD COIN to collide with the player, this object(gold coin)gets the variable SCORE of a script that has the text canvas and there adds 150 points. But this goes to collide with an error. "NullReferenceException: Object reference not set to an instance of an object Boo.Lang.Runtime.RuntimeServices.InvokeBinaryOperator ".

How do I fix this? Sorry, I use google translator, thank you very much.

Part of the script: GOLD COIN

 var hudscore : GameObject;
 
 function Awake(){
 hudscore = GameObject.Find("ScoreNumero");
 hudscore.GetComponent(Puntajes);
 }
 function OnTriggerEnter (collision : Collider) {
 
 if(collision.gameObject.CompareTag("Player")&& posible == 1){
 
     sumarpuntaje();
 
 }
 
 }
 
 function sumarpuntaje(){
     hudscore.score += 150;
     diamante.renderer.enabled = false;
     Destroy (gameObject);
 }

Text CANVAS import UnityEngine; import UnityEngine.UI; var Texto : Text; public var score : int; function Awake(){ Texto.GetComponent(Text); } function Update(){ Texto.text = "Score : " + score; }