The modifier ‘private’ is not valid for this item

Question

I'm having a problem and i don't know how to resolve it. The error is on the line 42 of the code:

using UnityEngine;
using System.Collections;

public class Bullet : MonoBehaviour
{
    [Header("BulletConfig")]
    public int range;
    public int damage;
    public float mass;
    public float speed;
    [Header("Imports")]
    public PlayerController Player;
    public ParticleSystem impact;

    //Privates
    private Rigidbody rb;
    private Vector3 origin;

    void Start()
    {
        rb = GetComponents();
        origin = transform.position;
    }

    void Update()
    {
        //Massa
        rb.mass = mass;

        //Frente
        Vector3 horizontal = transform.right * 0;
        Vector3 vertical = transform.forward * 1;
        Vector3 velocity = (horizontal + vertical).normalized * speed;
        rb.MovePosition(rb.position + velocity * Time.fixedDeltaTime);

        //Range
        if (Vector3.Distance(origin, transform.position) > range)
        {
            Destroy(GameObject);
        }

        private void OnCollisionEnter(Collision collision)
        {
            Destroy(gameObject);
            if (collision.gameObject.tag == "Terrain")
            {
                GameObject eff = Instantiate(impact, collision.transform.position, Quaternion.Identity).gameObject;
                eff.transform.position += new Vector3(0, 0.1f, 0);
                eff.transform.eulerAngles = new Vector3(-90, 0, 0);
            }
        }
    }
}