it says, that this script already has a definition for HitWeapons what am i doing wrong? please give the answer in C#

 public GameObject SelectedWeapon;
 public GameObject LastSelectedWeapon;
 public GameObject GunHolder;

 public int PickupDistance = 6;
 public int O = 0;

 private bool HitWeapons = false;

 private Ray ray;
 private RaycastHit hit;

 // Use this for initialization
 void Start () 
 {
 GunHolder = GameObject.FindWithTag("GunHolder");
 }

 // Update is called once per frame
 void Update () 
 {
 ray = transform.camera.ScreenPointToRay (new Vector3(Screen.width / 2, Screen.height / 2, 0));
 HitWeapons = true;
 if(Physics.Raycast(ray, hit, PickupDistance))
 {
 if(hit.collider.gameObject.tag == "PickUp")
 {
 HitWeapons = false;
 SelectedWeapon = hit.collider.gameObject;
 isEquipped : boolean = CheckWeapons();
 if(lastSelectedWeapon != selectedWeapon)
 {
 if(lastSelectedWeapon != null) 
 {
 lastSelectedWeapon.GetComponent("SelectableWeapon").unSelect();
 lastSelectedWeapon = selectedWeapon;
 selectedWeapon.GetComponent("SelectableWeapon").select(isEquipped);
 }
 }
 }
 }

 if(!HitWeapons)
 {
 if(lastSelectedWeapon != null)
 {
 lastSelectedWeapon.GetComponent("SelectableWeapon").unSelect();
 selectedWeapon = null;
 lastSelectedWeapon = null;
 }
 }

 if(selectedWeapon && Input.GetButtonDown("Pickup"))
 {
 if(gunscript.takingOut)
 {
 return;
 for(i = O ; i < playerWeapons.weapons.length; i++)
 {
 if(playerWeapons.weapons[i] == selectedWeapon.GetComponent(SelectableWeapon).weapon)
 {
 return;
 }

 playerWeapons.weapons[playerWeapons.selectedWeapon].gameObject.BroadcastMessage("deselectWeapon");
 playerWeapons.weapons[playerWeapons.selectedWeapon] = selectedWeapon.GetComponent(SelectableWeapon).weapon;
 playerWeapons.SelectWeapon(playerWeapons.selectedWeapon);
 selectedWeapon.GetComponent("SelectableWeapon").select(true);
 }
 }
 }
 } 

 void CheckWeapons ()
 {
 for (i = O; i < playerWeapons.weapons.length; i++) 
 {
 if (playerWeapons.weapons[i] == selectedWeapon.GetComponent("SelectableWeapon").weapon)
 {
 return true;
 }
 }

 return false;

 }

 void HitWeapons ()
 {
 if(Physics.Raycast(ray, hit, PickupDistance))
 {
 if(hit.collider.gameObject.tag == "Weapons")
 {
 RayHitWeapon = true;
 }
 }

 if(Physics.Raycast(ray, hit, PickupDistance))
 {
 if(!hit.collider.gameObject.tag == "Weapons")
 {
 RayHitWeapon = false;
 }
 }
 }