BCE 0005 unknown identifier error when accessing global variable.

I have a problem here, i am trying to make a life display with 3 images. when the character touches a trap it has a life deducted. i have declared the LIVES to be global but when i try to access it using my fpswalker it come with error bce0005 unknown identifier

 var health1: Texture2D;// 1 life left
 var health2: Texture2D;//2 life left
 var health3: Texture2D; //full  health
 
 
 static var LIVES =3; // Global variable(static) - accessible by any script
 
 function Update () {
     print("Lives: "+ LIVES + "Hits: "+HITS); 
     switch(LIVES){
         case 3:
             guiTexture.texture = health3;
         break;
         case 2:
             guiTexture.texture = health2;
         break;
         case 1:
             guiTexture.texture = health1;
         break;
         case 0:
             //gameover script
         break;
     }
     
 }

Below is my fpswalker script.

 var speed = 6.0;
 var jumpSpeed = 8.0;
 var gravity = 20.0;
 
 private var moveDirection = Vector3.zero;
 private var grounded : boolean = false;
 
 function OnTriggerEnter(hit: Collider){ //hit is a controllercolliderhit type
     if(hit.gameObject.tag == "TrapPoison"){
         HealthCtrl1.LIVES -=1; 
 // this is the part getting error when trying to run
     }
 }
 function FixedUpdate() {
     
     if (grounded) {
         // We are grounded, so recalculate movedirection directly from axes
         moveDirection = new Vector3(Input.GetAxis("Horizontal"), 0, Input.GetAxis("Vertical"));
         moveDirection = transform.TransformDirection(moveDirection);
         moveDirection *= speed;
         
         if (Input.GetButton ("Jump")) {
             moveDirection.y = jumpSpeed;
         }
     }
     // Apply gravity
     moveDirection.y -= gravity * Time.deltaTime;
     
     // Move the controller
     var controller : CharacterController = GetComponent(CharacterController);
     var flags = controller.Move(moveDirection * Time.deltaTime);
     grounded = (flags & CollisionFlags.CollidedBelow) != 0;
 }