I need help with collision detection event

Hi guys,

I have a 2D object that I call "Player" and have this script attached to it so I can detect any collision it makes with other objects

 public class PlayerCollision : MonoBehaviour {
 
     // Use this for initialization
     void Start () {
     
     }
     
     // Update is called once per frame
     void Update () {
     
     }
 
     void OnTriggerEnter(Collider col) {
         Debug.Log ("1");
         if (col.gameObject.name == "Rocket") {
             Debug.Log ("2");        
         }
     }
 }

The two Debug.Log() calls were only for testing purposes. However, as I tested, neither returns a result, so I'd assume the event was never triggered.

I made sure to tick "Is Trigger" on "Player"'s collider, as you can see from the below screenshot

The other object, which was supposed to collide with "Player" is called "Rocket", and below is its collider

I don't know where the problem might be, please lend me your aid! All efforts are appreciated. Thank you very much !