onCollisionEnter2D doesn't work

This my first time making a game and I can't get this to work.
I've spend at least 3 hours troubleshooting but I just don't get it to work.

this is my code:

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4.  
5. public class restart : MonoBehaviour
6. {
7.     public GameObject gameOverText, RestartButton;
8.  
9.     // Start is called before the first frame update
10.     void Start()
11.     {
12.         gameOverText.SetActive(false);
13.         RestartButton.SetActive(false);
14.     }
15.  
16.     void onCollisionEnter2D(Collision2D col)
17.     {
18.         if (col.gameObject.tag.Equals("Enemy"))
19.         {
20.             Debug.Log("It does work!");
21.             gameOverText.SetActive(true);
22.             RestartButton.SetActive(true);
23.             gameObject.SetActive(false);
24.         }
25.     }
26. }
27.  

I even tried to make a really simple script to see if that would work but it sadly doesn't.
This is the code I used for it:

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4.  
5. public class testcollision : MonoBehaviour
6. {
7.     void onCollisionEnter2D(Collision2D coll)
8.     {
9.         Debug.Log("It works!");
10.     }
11. }

I've probally been making a silly little mistake the whole time but I can't seem to find it.

Someone please help

 

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