Calling method from another script. Null Error.

This is Method that I want to call.

Code (CSharp):

1. public class Canvas : MonoBehaviour
2. {
3.     [SerializeField] TextMeshProUGUI m_Object;
4.     [SerializeField] TextMeshProUGUI n_Object;
5.     int E = 10;
6.     int P = 10;
7.     void Start()
8.     {
9.        
10.    
11.        
12.     }
13.  
14.     // Update is called once per frame
15.     void Update()
16.     {
17.    
18.     }
19.     public void LiveSetter()
20.     {
21.         P -= 1;
22.         string m = P.ToString();
23.         m_Object.text = "Your Live = "+ m ;
24.     }
25.     public void ELiveSetter()
26.     {
27.         E -= 1;
28.         string m = E.ToString();
29.         n_Object.text = "Enemy Live = " + m;
30.     }
31.    
32. }

and this is where I want to call

Code (CSharp):

1. public class EnemyBase : MonoBehaviour
2. {
3.     public int ELives = 10;
4.     public Canvas canvas;
5.     void Start()
6.     {
7.  
8.     }
9.  
10.     // Update is called once per frame
11.     void Update()
12.     {
13.  
14.     }
15.     private void OnCollisionEnter(Collision otherObj)
16.     {
17.         if (otherObj.gameObject.tag == "Player")
18.         {
19.             ELives -= 1;
20.             canvas.ELiveSetter();
21.            
22.            
23.         }
24.     }
25. }

But When I want to play game I took this error. Null reference.

 

Gonna guess you haven't assigned the canvas in the inspector in your Enemy base script.

Edit: Also, you shouldn't name your scripts the same name as Unity classes. Canvas is also a class in UnityEngine.UI namespace, and naming your own script the same thing is going to cause you a world of headache.

 

Thank You so much. I was trying to find solution for 4 hours. I didn't know this necessity. It solved my problem. and Thanks for your advice. I will be more carefull.