try to use values of c# script in a Javascript, Unity collapsed

I'm doing a test, trying to deal with data from a c# in a Javascript. I have put the Javascript outside the standard Assert folder and the compilation was fine. But Unity collapse everytime when I try to run. I'm just reading a variable from c#: c#script:

 using UnityEngine;
 using System.Collections;
 
 public class TestNumber : MonoBehaviour {
     public int Num=33;
     // Use this for initialization
     void Start () {
         Num=33;
     }
     
     // Update is called once per frame
     void Update () {
     
     }
 }

The Javascript:

 #pragma strict
 
 
 var serialInformation:TestNumber; 
 var count:int;
 
 
 function Start () {
     count=0;
 
 }
 
 function Update () {
     count = serialInformation.Num;
     print(count);
 
 }