The name `GetComponent' does not exist in the current context

Hi,
I am working on this code.I take this GetComponent code from other example.in example code its working but in my code i take The name `GetComponent' does not exist in the current context error.How can i solve this ?

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3. using UnityEngine.Networking;
4. using UnityEngine.UI;
5.  
6.  
7. [RequireComponent(typeof(SteamVR_TrackedObject))]
8. public class Player_Shoot : NetworkBehavior {
9.     private float damage = 25;
10.     private float range = 200;
11.     [SerializeField]
12.     private Transform camTransform;
13.     private RaycastHit hit;
14.     // Use this for initialization
15.     SteamVR_TrackedObject trackedObj;
16.     void Awake()
17.     {
18.         trackedObj =  GetComponent<SteamVR_TrackedObject>();
19.        
20.     }
21.  
22.     void Start () {
23.      
24.  
25.     }
26.  
27.  
28.     // Update is called once per frame
29.     void FixedUpdate () {
30.        
31.         CheckIfShooting();
32.     }
33.  
34.     private void CheckIfShooting()
35.     {
36.         if (true)
37.         {
38.             return;
39.         }
40.         else
41.         {
42.             var device = SteamVR_Controller.Input((int)trackedObj.index);
43.             if (device.GetTouchDown(SteamVR_Controller.ButtonMask.Trigger))
44.             {
45.                 Shoot();
46.                 Debug.Log("Tuşa bastı");
47.             }
48.         }
49.     }
50.  
51.     void Shoot()
52.     {
53.         if (Physics.Raycast(camTransform.TransformPoint(0,0,0.5f),camTransform.forward,out hit,range))
54.         {
55.             Debug.Log(hit.transform.tag);
56.             if (hit.transform.tag == "Enemy")
57.             {
58.                 string uIdentity = hit.transform.name;
59.                 CmdTellServerWhoWasShot(uIdentity, damage);
60.             }
61.         }
62.     }
63.     [Command]
64.      void CmdTellServerWhoWasShot(string uIdentity, float damage)
65.     {
66.         GameObject go = GameObject.Find(uIdentity);
67.         //Apply Damage to zombie
68.     }
69. }
70.