error CS0131: The left-hand side of an assignment must be a variable, property or indexer

I need help with this error i have been having error CS0131: The left-hand side of an assignment must be a variable, property or indexer(line: 59)i've searched on google couldn't find an answer. What am i doing wrong?

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4.  
5. public class PlayerMovement : MonoBehaviour
6. {
7.      public float speed;
8.      public float jumpForce;
9.      private float moveInput;
10.  
11.     private Rigidbody2D rb;
12.  
13.     private bool facingRight = true;
14.  
15.     private bool isGrounded;
16.     public Transform groundCheck;
17.     public float checkRadius;
18.     public LayerMask whatIsGround;
19.  
20.     private int extraJumps;
21.     public int extraJumpsValue = 1;
22.  
23.     // Start is called before the first frame update
24.     void Start()
25.     {
26.         extraJumps = extraJumpsValue;
27.         rb = GetComponent<Rigidbody2D>();
28.     }
29.  
30.     // Update is called once per frame
31.     void FixedUpdate()
32.     {
33.         isGrounded = Physics2D.OverlapCircle(groundCheck.position, checkRadius, whatIsGround);
34.  
35.  
36.  
37.         moveInput = Input.GetAxisRaw("Horizontal");
38.         Debug.Log(moveInput);
39.         rb.velocity = new Vector2(moveInput * speed, rb.velocity.y);
40.  
41.         if(facingRight == false && moveInput > 0 ){
42.           Flip();
43.  
44.         }else if(facingRight == true && moveInput < 0){
45.             Flip();
46.         }
47.  
48.     }
49.     void Update(){
50.      
51.         if(isGrounded == true){
52.             extraJumps = extraJumpsValue;
53.         }
54.  
55.         if(Input.GetKeyDown(KeyCode.Space) && extraJumps > 0){
56.         extraJumps--;
57.         rb.velocity = Vector2.up * jumpForce;
58.         }
59.         else if(Input.GetKeyDown(KeyCode.Space) && extraJumps == 0 && isGrounded = true){
60.          rb.velocity = Vector2.up * jumpForce;
61.         }
62.     }
63.  
64.     void Flip(){
65.  
66.         facingRight = !facingRight;
67.         Vector3 Scaler = transform.localScale;
68.         Scaler.x *= -1;
69.         transform.localScale = Scaler;
70.     }
71. }
72.  

 

Pretty sure you meant == true instead of = true in line 59. Also, isGrounded == true is the same as just isGrounded. And isGrounded == false is the same as !isGrounded. There is no need to compare a bool to a (hardcoded) bool.
So you may as well just write && isGrounded there

 

Thanks