Health bar script not working, bar not reducing with player's vitality

I need a health bar that decreases proportionately with the player’s vitality, but the script has given the error “An instance of type ‘healthBar’ is required to access non static member ‘fgImage’”.
I have been through the forums (I know that there are so many health bar related questions) - but I still can’t work out how to make the health bar work properly.

Here is the health bar script:

var energyBar : GUIStyle ;
   
    var bgImage : Texture2D; 
    var fgImage : Texture2D; 
    static var playerEnergy = 1.0;     
    var maxHealth : int = 100.0;
    var curHealth : int = 70.0;
    var percentHealth : Number = curHealth / maxHealth;
     
    function Start() {
  
    }
     
    function Update() {
    
    }
     
    function OnGUI () {

    GUI.BeginGroup (Rect (10,10,256,32));
     
    GUI.Box (Rect (0,0,256,32), bgImage, energyBar);
     
    GUI.BeginGroup (Rect (0,0,playerEnergy * 256, 32));
     
    GUI.Box (Rect (0,0,256,32), fgImage, energyBar);
     
    GUI.EndGroup ();
    GUI.EndGroup ();
    }
    
    function updateHealthBar () : void
    {
    percentHealth = curHealth / maxHealth;
    healthBar.fgImage.ScaleX = percentHealth;
    }

If anyone has the time to point out how to sort out the errors I would be so grateful.
Thanks in advance, Laurien

Try change the maxHealth and curHealth to floats.

Unity doesn’t like dealing with integers for percentages.

— Then —

Replace your healthBar.fgImage.ScaleX

to

healthBar.fgImage.transform.scale.x

OK. The debug line says exactly what is wrong. You do not have an instance of healthBar available so your code is accessing fgImage as a static variable. Instead of:

healthBar.fgImage.ScaleX = percentHealth;

try this:

fgImage.ScaleX = percentHealth;

Hopefully that will remedy the static reference error.