Unity Score System

I am trying to create a score system on unity where whenever the game object tagged "Mean" hits an empty game object (Both have a rigid body and box collider attached to it) the score goes up by one. Here is my code. For some reason nothing happens when I run it, but no errors come up. Thanks

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3.  
4. public class Scorer : MonoBehaviour {
5.  
6.     public static int totalScore;
7.     public static float runScore;
8.    
9.  
10.     void Awake()
11.     {
12.         totalScore = 0;
13.         runScore = 0;
14.     }
15.    
16.    
17.  
18.     void OnGUI()
19.     {
20.        
21.  
22.         GUI.Label(new Rect(0, 4, 200, 50), "Total Score: " + totalScore);
23.        
24.     }
25.     // Use this for initialization
26.     void Start () {
27.    
28.     }
29.    
30.     // Update is called once per frame
31.     void Update () {
32.    
33.     }
34.  
35.  
36.     void OnCollisionEnter2D(Collision2D coll) {
37.         if(coll.gameObject.tag == "Enemy")  {
38.  
39.             totalScore ++;
40.         }
41.  
42.     }
43.  
44. }
45.  

 

You're testing for 2D collisions. Are you sure that you added BoxCollider2D and RigidBody2D? Otherwise it won't work. Just asking, you only said BoxCollider and RigidBody, these are 3D objects.