Why isn't this collision being triggered?

Question

I have this script attached to a game object in unity that when touching another gameobject with the tag "wisdom", will trigger this event. there are no error codes, and the debug.log isn't working either.

using System.Collections.Generic;
using UnityEngine;

public class range : MonoBehaviour
{
    public GameObject big;
    // Start is called before the first frame update


     public void OnTriggerEnter(Collider col){
            if(col.gameObject.tag == "wisdom"){
                    Debug.Log("yourmother");
                         big.SetActive(true);
             }
     }
     public void OnTriggerExit(Collider col){
                    if(col.gameObject.tag == "wisdom"){
                         big.SetActive(false);
             }

}
}