Why is this script not working!!!

Help! The error says the message has to be of type collision or it will be ignored!

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3.  
4. public class PickingupPickups : MonoBehaviour {
5.     public string WeaponName;
6.     // Use this for initialization
7.     void Start () {
8.        
9.     }
10.    
11.     // Update is called once per frame
12.     void Update () {
13.        
14.     }
15.     private void OnCollisionEnter(Collision collision) {
16.         string namecheck = collision.gameObject.name.Substring (6);
17.         Debug.Log (namecheck);
18.         if (namecheck == "Pickup") {
19.             Debug.Log("Pickup collided with!");
20.         }
21.     }
22. }

 

What line does the error point to, exactly?

 

pasted that code in and put it on a gameobject, no errors... going to need to see all the error text

 

errors gone but it won't output anything @LeftyRighty @StarManta

 

@LeftyRighty @StarManta I forgot to put a collider in the Pickup.... Sorry!