Destroy game object with tag

Hi so I am trying to get my player to be able to pick up health items with the following code:

 var maxHealth = 100;
  public static var currentHealth = 100;
  var PlayerHealthDisplay : GUIText; 
  var meep;
  function Start() {
      DisplayAmount();
  }
  
  function DisplayAmount () {
      PlayerHealthDisplay.text = ""+ currentHealth;
  }
 function OnTriggerEnter(collider:Collider) {
 meep = gameObject.FindGameObjectsWithTag ("meep");
     if (collider.tag == "beep"){
          
          currentHealth += -10;
          PlayerHealthDisplay.text = ""+ currentHealth;
      }
      else if (collider.tag == "meep"){
          currentHealth += 5;
          PlayerHealthDisplay.text = ""+ currentHealth;
          Destroy(meep);
      }
  }

The health points on objects tagged with "meep" are added but the specific health object I run over is not destroyed. When I run over the object, I get the error:

InvalidCastException: Cannot cast from source type to destination type. health.OnTriggerEnter (UnityEngine.Collider collider) (at Assets/health.js:22)

I would like to be able to run over an object, destroy only this health object, not the others, and receive health points. Thanks!