Player take damage on collision with AI

I am new to coding and I am trying to make my player take damage when an AI touches it, this is my code so far:

  var maxHealth = 100;
      public static var currentHealth = 100;
      var PlayerHealthDisplay : GUIText; 
      function Start() {
          DisplayAmount();
      }
      
      function DisplayAmount () {
          PlayerHealthDisplay.text = ""+ currentHealth;
      }
     function OOnTriggerEnter(collider:Collider) {
         if (collider.tag == "beep"){
              
              currentHealth += -10;
              PlayerHealthDisplay.text = ""+ currentHealth;
          }
      }

The player does not take any damage though, how should I change it?

Typo here:

  function OOnTriggerEnter(collider:Collider) {

one too many O in OnTriggerEnter