Problem with rigidbody2d missing component exception

Hello. I'am making 2d game with tutorial (https://gamedevelopment.tutsplus.co...th-unity-player-and-ball-mechanics--cms-20860) based on unity 4 so there is a problem because i'am using 2017. I found som info in doc https://docs.unity3d.com/ScriptReference/Rigidbody-isKinematic.html . I replace orginal code rigidbody2D.isKinematic to new one but my project don't see rigidbody component.
"MissingComponentException: There is no 'Rigidbody' attached to the "Ball" game object, but a script is trying to access it."
Can you help me please? There is a code:

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3. using System.Collections.Generic;
4.  
5. public class BallScript : MonoBehaviour
6. {
7.  
8.     private bool ballIsActive;
9.     private Vector3 ballPosition;
10.     private Vector2 ballInitialForce;
11.     private Rigidbody rb;
12.     public GameObject playerObject;
13.  
14.     void Start()
15.     {
16.         ballInitialForce = new Vector2(100.0f, 300.0f);
17.         ballIsActive = false;
18.         ballPosition = transform.position;
19.     }
20.  
21.     void Update()
22.     {
23.         rb = GetComponent<Rigidbody>();
24.      
25.         if (Input.GetButtonDown("Jump") == true)
26.         {
27.          
28.             if (!ballIsActive)
29.             {
30.            
31.                 rb.isKinematic = false;
32.  
33.              
34.                 rb.AddForce(ballInitialForce);
35.  
36.                
37.                 ballIsActive = !ballIsActive;
38.             }
39.         }
40.  
41.         if (!ballIsActive && playerObject != null)
42.         {
43.  
44.             // get and use the player position
45.             ballPosition.x = playerObject.transform.position.x;
46.  
47.             // apply player X position to the ball
48.             transform.position = ballPosition;
49.         }
50.  
51.         // Check if ball falls
52.         if (ballIsActive && transform.position.y < -6)
53.         {
54.             ballIsActive = !ballIsActive;
55.             ballPosition.x = playerObject.transform.position.x;
56.             ballPosition.y = -4.2f;
57.             transform.position = ballPosition;
58.  
59.             rb.isKinematic = true;
60.         }
61.  
62.     }
63. }

 

hi. Try

rb = GetComponent<Rigidbody2D>();

Your version is:
rb = GetComponent<Rigidbody>();

Rigidbody uses (vector3) in parameters, but Rigidbody2D uses (vector2)

https://docs.unity3d.com/ru/current/ScriptReference/Rigidbody.AddForce.html

 

Try this solution.

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3. using System.Collections.Generic;
4.  
5. [RequireComponent(typeof(Rigidbody2D))]
6. public class BallScript : MonoBehaviour{
7.     private bool ballIsActive;
8.     private Vector3 ballPosition;
9.     private Vector2 ballInitialForce;
10.     private Rigidbody2D rb;
11.     public GameObject playerObject;
12.  
13.     void Start(){
14.         ballInitialForce = new Vector2(100.0f, 300.0f);
15.         ballIsActive = false;
16.         ballPosition = transform.position;
17.         rb = GetComponent<Rigidbody2D>();
18.     }
19.  
20.     void Update(){
21.  
22.         if (Input.GetButtonDown("Jump") == true){
23.  
24.             if (!ballIsActive && rb != null) {
25.    
26.                 rb.isKinematic = false;
27.      
28.                 rb.AddForce(ballInitialForce);
29.        
30.                 ballIsActive = !ballIsActive;
31.             }
32.         }
33.         if (!ballIsActive && playerObject != null){
34.             // get and use the player position
35.             ballPosition.x = playerObject.transform.position.x;
36.             // apply player X position to the ball
37.             transform.position = ballPosition;
38.         }
39.         // Check if ball falls
40.         if (ballIsActive && transform.position.y < -6){
41.             ballIsActive = !ballIsActive;
42.             ballPosition.x = playerObject.transform.position.x;
43.             ballPosition.y = -4.2f;
44.             transform.position = ballPosition;
45.             rb.isKinematic = true;
46.         }
47.     }
48. }

Cheers