OnCollisionEnter not working

So I am a fairly new user trying to make a game where you roll a ball to a portal. I made some lava that is supposed to make the player respawn when it touches the player. The player has a rigidbody2d and a box collider. The lava does not. I have a gameobject that contains all the lava in it.

The game is in 2D.

My Collision Script (attached to player) :

using UnityEngine; using UnityEngine.SceneManagement;

public class CharacterIsHarmed : MonoBehaviour {

 public string SceneName;
 public bool DebugCollide = false;

 // Update is called once per frame
 void Update(){

     if (DebugCollide == true) {
         SceneManager.LoadScene (SceneName);
         DebugCollide = false;
     }



 }

 void OnCollisionEnter (Collision col) 
 {

     if (col.collider.name == "Lava") 
     {

         DebugCollide = true;
     }

 }
     

}

The Gameobject containing the lava is named Lava.

After a bit of debugging thanks to @chiker and @KittenSnipes I found out that the collider was working but it would not say what i was colliding with.