Box Collider Trigger not working

Hey, I set up an empty GameObject and attached a Box Collider as a Trigger (2D Game). Afterwards i attached the following script to the GameObject:

 using UnityEngine;
 using System.Collections;
 
 public class boxSideCollider : MonoBehaviour {
 
     void OnTriggerEnter(Collider other){
         Debug.Log ("Enter");
         GameObject player = GameObject.FindGameObjectWithTag("Player");
         player.GetComponent<CharControllerScript>().Dead();
     }
 }

Neither the logtext nor the other code appears/works when the character is entering the zone.

Can somebody help me? Thanks!