CS0106 The modifier 'private' is not valid for this item

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4.  
5. public class PlayerController : MonoBehaviour
6. {
7.  
8.  
9.     Rigidbody2D rb;
10.  
11.  
12.     [SerializeField]
13.     float jumpForce;
14.  
15.     bool grounded;
16.  
17.     private void Awake()
18.     {
19.         rb = GetComponent<Rigidbody2D>();
20.     }
21.  
22.  
23.  
24.     // Update is called once per frame
25.     void Update()
26.     {
27.         if (Input.GetMouseButtonDown(0))
28.         {
29.             if (grounded)
30.             {
31.  
32.                 Jump();
33.             }
34.  
35.         }
36.  
37.         void Jump()
38.         {
39.             grounded = false;
40.  
41.             rb.velocity = Vector2.up * jumpForce;
42.         }
43.  
44.  
45.         private void OnCollisionEnter2D(Collision2D collision)
46.      
47.         {
48.             if (collision.gameObject.tag == "Ground")
49.             {
50.                 grounded = true;
51.             }
52.         }
53.  
54. }   }
55.  

I can't seem to figure out what's wrong with this code. I checked and can't see any } errors or anything, but i'm new so maybe I'm missing something.