Object reference not set to an Instance of an object

Hi,

I have two scripts (for practice) Script A should handle key inputs and depending on the pressed key it should call a function from another script B. For example if I press R the keyhandler script (A) should call a function of script B and the function in script B should change the color of the gameobject.

//Keyhandler

Code (CSharp):

1. public class A : MonoBehaviour {
2.  
3.  
4.     public B b;
5.     // Use this for initialization
6.     void Start () {
7.        
8.     }
9.    
10.     // Update is called once per frame
11.     void Update () {
12.  
13.         if (Input.GetKeyDown(KeyCode.R))
14.         {
15.            
16.            b.setRed();
17.         }
18.         if (Input.GetKeyDown(KeyCode.B))
19.         {
20.             b.setBlue();
21.         }
22.  
23.        
24.  
25.     }
26. }

//ColorChanger

Code (CSharp):

1. public class B : MonoBehaviour {
2.    
3.     public GameObject cube;
4.  
5.     // Use this for initialization
6.     void Start () {
7.      
8.     }
9.    
10.     // Update is called once per frame
11.     void Update () {
12.  
13.     }
14.  
15.     public void setBlue()
16.     {
17.        
18.         cube.GetComponent<Renderer>().material.color = Color.blue;
19.     }
20.  
21.     public void setRed()
22.     {
23.         cube.GetComponent<Renderer>().material.color = Color.red;
24.     }
25.    
26. }

I also linked my cube to the B Script.

 

But did you link your B script to the A script?

 

Im a stupid idiot I forgot to add the B script to the A script in the Inspector....

 

I could punch myself ....

 

Everybody does that now and then.