NullReferenceException in my Script

So I've been working on a 2D platformer, and in my code it is checking if the collider of the Frog is touching the ground layer, but when I try to run the game i get an error saying that there is an "Object reference not set to an instance of an object" in line 34 "if (coll.IsTouchingLayers(ground))". This is the script for the Frog :

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4.  
5. public class Frog : MonoBehaviour
6. {
7.     private Collider2D coll;
8.     private Rigidbody2D rb;
9.     private bool facingLeft = true;
10.  
11.     [SerializeField] private LayerMask ground;
12.     [SerializeField] private float leftCap;
13.     [SerializeField] private float rightCap;
14.     [SerializeField] private float jumpLength = 10f;
15.     [SerializeField] private float jumpHeight = 15f;
16.  
17.     private void Start()
18.     {
19.         GetComponent<Collider2D>();
20.         GetComponent<Rigidbody2D>();
21.     }
22.  
23.     private void Update()
24.     {
25.         if(facingLeft)
26.         {
27.             if(transform.position.x > leftCap)
28.             {
29.                 if (transform.localScale.x != 1)
30.                 {
31.                     transform.localScale = new Vector3(1, 1);
32.                 }
33.                
34.                 if (coll.IsTouchingLayers(ground))
35.                 {
36.                     rb.velocity = new Vector2(-jumpLength, jumpHeight);
37.                 }
38.             }
39.             else
40.             {
41.                 facingLeft = false;
42.             }
43.         }
44.  
45.         else
46.         {
47.             if (transform.position.x < rightCap)
48.             {
49.                 if (transform.localScale.x != -1)
50.                 {
51.                     transform.localScale = new Vector3(-1, 1);
52.                 }
53.  
54.                 if (coll.IsTouchingLayers(ground))
55.                 {
56.                     rb.velocity = new Vector2(jumpLength, jumpHeight);
57.                 }
58.             }
59.             else
60.             {
61.                 facingLeft = true;
62.             }
63.         }
64.     }
65. }

 

This is doing nothing:

Code (CSharp):

1.     private void Start()
2.     {
3.         GetComponent<Collider2D>();
4.         GetComponent<Rigidbody2D>();
5.     }

Your

coll

and

rb

fields aren't being assigned to.
They should be assigned like so:

Code (CSharp):

1.     private void Start()
2.     {
3.         coll = GetComponent<Collider2D>();
4.         rb = GetComponent<Rigidbody2D>();
5.     }

 

Oh wow. Thank you haha