Help with "Attach this script to a GameObject"

I am new to Unity and trying to rotate an object. I found the example script (below) that indicates I should attach it to a GameObject. I tried to drag and drop the C# script to the object (Cube) but that generates an error, "Can't add script behavior CallbackExecutor. The script needs to derive from MonoBehaviour."

The object in question is Cube, the C# script is "Rotator" and the class name is "Rotator", so how do you attach the script to a GameObject named Cube?

Code (CSharp):

1.  
2. //Attach this script to a GameObject
3. //This example shows the difference between using Space.world and Space.self.
4. //Enable or disable the checkbox in the Inspector before starting (depending on if you want world or self)
5. //Press play to see the GameObject rotating appropriately. Press space to switch between world and self.
6.  
7. using UnityEngine;
8.  
9. public class Rotator : MonoBehaviour
10. {
11.     float m_Speed;
12.     bool m_WorldSpace;
13.  
14.     void Start()
15.     {
16.         //Set the speed of the rotation
17.         m_Speed = 20.0f;
18.         //Start off in World.Space
19.         m_WorldSpace = true;
20.         //Rotate the GameObject a little at the start to show the difference between Space and Local
21.         transform.Rotate(60, 0, 60);
22.     }
23.  
24.     void Update()
25.     {
26.         //Rotate the GameObject in World Space if in the m_WorldSpace state
27.         if (m_WorldSpace)
28.             transform.Rotate(Vector3.up * m_Speed * Time.deltaTime, Space.World);
29.         //Otherwise, rotate the GameObject in local space
30.         else
31.             transform.Rotate(Vector3.up * m_Speed * Time.deltaTime, Space.Self);
32.  
33.         //Press the Space button to switch between world and local space states
34.         if (Input.GetKeyDown(KeyCode.Space))
35.         {
36.             //Make the current state switch to the other state
37.             m_WorldSpace = !m_WorldSpace;
38.             //Output the Current state to the console
39.             Debug.Log("World Space : " + m_WorldSpace.ToString());
40.         }
41.     }
42. }
43.  

 

Most likely that error is being shown because you have script compilation errors. If you open the console window and hit clear, you should be left with only compiler errors; what are they?

 

You were correct sir. There was a naming error because there was another item already named Rotator. I fixed that and now it is working.

Thanks for the help.