Unassigned Varible

Hi I keep getting an error stating

UnassignedReferenceException: The variable Bubble1 of Ability_Select_and_Fire has not assigned.

heres the code in a nushell`

#pragma strict

var Selc1 : GameObject;
var Selc2 : GameObject;
var Selc3 : GameObject;
var Selc4 : GameObject;
var Selc5 : GameObject;
var Selc6 : GameObject;
var Selc7 : GameObject;
var Selc8 : GameObject;
var Selc9 : GameObject;
var Bubble1: GameObject;


function Start () {

}

function Update () {

    if(Bubble1 == null){

        GameObject.Find("/Canvas/RawImage/Bubble1");

    }

	if (Input.GetKey(KeyCode.Alpha1))
	{
	
		
		Selc1.SetActive (true);
		Selc2.SetActive (false);
		Selc3.SetActive (false);
		Selc4.SetActive (false);
		Selc5.SetActive (false);
		Selc6.SetActive (false);	
		Selc7.SetActive (false);
		Selc8.SetActive (false);	
		Selc9.SetActive (false);
	}

	if (Input.GetKey(KeyCode.Alpha2))
	{
	
		Selc1.SetActive (false);
		Selc2.SetActive (true);
		Selc3.SetActive (false);
		Selc4.SetActive (false);
		Selc5.SetActive (false);
		Selc6.SetActive (false);	
		Selc7.SetActive (false);
		Selc8.SetActive (false);	
		Selc9.SetActive (false);
	}
	
	if (Input.GetKey(KeyCode.Alpha3))
	{
	
		Selc1.SetActive (false);
		Selc2.SetActive (false);
		Selc3.SetActive (true);
		Selc4.SetActive (false);
		Selc5.SetActive (false);
		Selc6.SetActive (false);	
		Selc7.SetActive (false);
		Selc8.SetActive (false);	
		Selc9.SetActive (false);
	}

	if (Input.GetKey(KeyCode.Alpha4))
	{
	
		Selc1.SetActive (false);
		Selc2.SetActive (false);
		Selc3.SetActive (false);
		Selc4.SetActive (true);
		Selc5.SetActive (false);
		Selc6.SetActive (false);	
		Selc7.SetActive (false);
		Selc8.SetActive (false);	
		Selc9.SetActive (false);
	}
	
	if (Input.GetKey(KeyCode.Alpha5))
	{
	
		Selc1.SetActive (false);
		Selc2.SetActive (false);
		Selc3.SetActive (false);
		Selc4.SetActive (false);
		Selc5.SetActive (true);
		Selc6.SetActive (false);	
		Selc7.SetActive (false);
		Selc8.SetActive (false);	
		Selc9.SetActive (false);
	}

	if (Input.GetKey(KeyCode.Alpha6))
	{
	
		Selc1.SetActive (false);
		Selc2.SetActive (false);
		Selc3.SetActive (false);
		Selc4.SetActive (false);
		Selc5.SetActive (false);
		Selc6.SetActive (true);	
		Selc7.SetActive (false);
		Selc8.SetActive (false);	
		Selc9.SetActive (false);
	}
	
	if (Input.GetKey(KeyCode.Alpha7))
	{
	
		Selc1.SetActive (false);
		Selc2.SetActive (false);
		Selc3.SetActive (false);
		Selc4.SetActive (false);
		Selc5.SetActive (false);
		Selc6.SetActive (false);	
		Selc7.SetActive (true);
		Selc8.SetActive (false);	
		Selc9.SetActive (false);
	}
	
	if (Input.GetKey(KeyCode.Alpha8))
	{
	
		Selc1.SetActive (false);
		Selc2.SetActive (false);
		Selc3.SetActive (false);
		Selc4.SetActive (false);
		Selc5.SetActive (false);
		Selc6.SetActive (false);	
		Selc7.SetActive (false);
		Selc8.SetActive (true);	
		Selc9.SetActive (false);
	}
	
	if (Input.GetKey(KeyCode.Alpha9))
	{
	
		Selc1.SetActive (false);
		Selc2.SetActive (false);
		Selc3.SetActive (false);
		Selc4.SetActive (false);
		Selc5.SetActive (false);
		Selc6.SetActive (false);	
		Selc7.SetActive (false);
		Selc8.SetActive (false);	
		Selc9.SetActive (true);
	}

	
}

function SetActive () {

        Bubble1.SetActive (true);	
	    Debug.Log ("This Is test Function ASA to ASF");
	}

So I don’t know JS really but at line 23:

GameObject.Find("/Canvas/RawImage/Bubble1");

you are calling GameObject.Find but not setting Bubble1 with it.