The referenced script on this Behaviour is missing!

i had a problem with a script, but i fixed it and here is an another problem about that a same script which i have fixed erlyier. so im trying to say that in scripts everything is allright, i chacked it many times and but every time when im trying to enter a play mode i get this message: "The referenced script on this Behaviour is missing!" please help me if you can. here is my script picture :

Code (CSharp):

1.  
2. using UnityEngine;
3. using System.Collections;
4.  
5. public class ball : MonoBehaviour {
6.    
7.     public float ballVelocity = 3000;
8.    
9.     Rigidbody rb;
10.     bool isPlay;
11.     int randInt;
12.    
13.     void Awake ()
14.     {
15.         rb = gameObject.GetComponent<Rigidbody>();
16.         randInt = Random.Range (1,3);
17.     }
18.    
19.     void Update ()
20.     {
21.         if(Input.GetMouseButton(0) == true && isPlay == false)
22.         {
23.             transform.parent = null;
24.             isPlay = true;
25.             rb.isKinematic = false;
26.             if(randInt == 1)
27.             {
28.                 rb.AddForce(new Vector3(ballVelocity,ballVelocity,0));
29.             }
30.             if(randInt == 2)
31.             {
32.                 rb.AddForce(new Vector3(-ballVelocity,-ballVelocity,0));
33.             }
34.         }
35.     }
36. }
37.  

 

Check the objects in your scene. One of them has a script attached to it but its link is missing. So check each object in the inspector to make sure no scripts are missing.

 

first everything was fine when i wrote first script about paddle (first object) everything was working perfectly but then i wrote other script for a ball (another object) this error massage maybe damaged the first object too, i mean after a second script everything gone wrong but i cant find a mistake (im trying to make a pong game by the way) here is some screenshots:

 

Make sure your scripts are all attached to GameObjects in your hierarchy pane. Its easy to miss this detail...