Unity "Obje" Kod hatası

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class silahoyal : MonoBehaviour {

    RaycastHit hit;
    Obje ob;
    public GameObject[] silahlar;
    
    void Start () {
        
    }
    
    void FixedUpdate (){
        if(Physics.Raycast(Camera.main.transform.position,Camera.main.transform.forward,out hit,4)){
            if(hit.transform.tag == "silah"){
              ob = hit.transform.gameObject.GetComponent<Obje>();
              if(Input.GetKeyDown(KeyCode.E)){
                Destroy(hit.transform.gameObject);
                silahacma(ob.isim);
                }
            }
            
        }
        

    }
    public void silahacma(string isim){
        switch (isim) {
            case "hk416" :
            break;
        
        }
    }
}