photonView with ID 2 has no method "deleteBot" marked with the [PunRPC](C#) or @PunRPC(JS) property! Args: | but i've already put my photon in

heyy im currently following a tutorial from youtube and i got a problem when i press delete button it says something like my question, can someone give me any clue ? thanks!

 using UnityEngine;
 using System.Collections;
 
 public class roomMan : Photon.MonoBehaviour {
 
     public string verNum = "0.1";
     public string roomName = "room01";
     public string playerName = "player 420";
     public Transform spawnPoint;
     public GameObject playerPref;
     public GameObject playerPref2;
     public bool isConnected = false;
     public bool isInRoom = false;
     public GameObject[] Ais;
     public GameObject[] curAis;
     public int kD;
 
 
 
     public InRoomChat chat;
 
     public Transform[] spawnPoints;
 
 
     void Update(){
         if (isInRoom) {
             chat.enabled = true;
         } else {
             //chat.enabled = false;
         }
 
         curAis = GameObject.FindGameObjectsWithTag ("Ai");
 
         if (Input.GetKeyDown (KeyCode.E) && isInRoom == false) {
             spawnAi ();
         }
         if (PlayerPrefs.GetInt ("kills") >= 1) {
             kD = PlayerPrefs.GetInt ("kills") / PlayerPrefs.GetInt ("deaths"); 
         } else {
             kD = 0;
         }
 
         PhotonNetwork.player.SetScore (PlayerPrefs.GetInt ("kills"));
     }
 
     void Start(){
 
         roomName = "Room " + Random.Range (0, 999);
         playerName = "Player " + Random.Range (0, 999);
         PhotonNetwork.ConnectUsingSettings (verNum);
         Debug.Log ("Starting Connection!");
 
         
         //PlayerPrefs.SetInt ("kills", 0);
         //PlayerPrefs.SetInt ("deaths", 0);
 
     }
 
     public void OnJoinedLobby(){
         //PhotonNetwork.JoinOrCreateRoom (roomName, null, null);
         isConnected = true;
         Debug.Log ("Starting Server!");
     }
 
     public void OnJoinedRoom(){
         PhotonNetwork.playerName = playerName;
 
         GameObject[] players = GameObject.FindGameObjectsWithTag ("Player");
         foreach(GameObject pl in players){
             if(pl.name == PhotonNetwork.playerName){
                 PhotonNetwork.playerName = playerName + " " + Random.Range (0,999);
             }
         }
 
 
         isConnected = false;
         isInRoom = true;
         //spawnPlayer ();
     }
 
 
     public void spawnPlayer(string prefName){
         isInRoom = false;
 
         GameObject[] players = GameObject.FindGameObjectsWithTag ("Player");
 
         foreach(PhotonPlayer pl2 in PhotonNetwork.playerList){
             if(pl2.name == PhotonNetwork.playerName){
                 PhotonNetwork.playerName = playerName + " " + Random.Range (0,999);
             }
         }
 
 
         GameObject pl = PhotonNetwork.Instantiate (prefName, spawnPoints[Random.Range (0, spawnPoints.Length)].position, spawnPoint.rotation, 0) as GameObject;
         pl.GetComponent<RigidbodyFPSWalker> ().enabled = true;
         pl.GetComponent<RigidbodyFPSWalker> ().fpsCam.SetActive (true);
         pl.GetComponent<RigidbodyFPSWalker> ().graphics.SetActive (false);
         
     }
 
     public void spawnAi(){
         GameObject ai1 = PhotonNetwork.Instantiate (Ais[Random.Range(0,Ais.Length)].name, spawnPoints[Random.Range (0, spawnPoints.Length)].position, spawnPoint.rotation, 0) as GameObject;
         ai1.GetComponent<aiCon> ().isMine = true;
 
     }
 
     void OnGUI(){
 
         if (isConnected) {
             Cursor.visible = true;
             Cursor.lockState = CursorLockMode.None;
             GUILayout.BeginArea (new Rect (Screen.width / 2 - 250, Screen.height / 2 - 250, 500,500));
             playerName = GUILayout.TextField (playerName);
             roomName = GUILayout.TextField (roomName);
 
             if (GUILayout.Button ("Create")) {
                 PhotonNetwork.JoinOrCreateRoom (roomName, null, null);
             }
 
             foreach (RoomInfo game in PhotonNetwork.GetRoomList()) {
                 if (GUILayout.Button (game.name + " " + game.playerCount + "/" + game.maxPlayers)) {
                     PhotonNetwork.JoinOrCreateRoom (game.name, null, null);
                 }
             }
             GUILayout.EndArea ();
         }
 
         if (isInRoom) {
             Cursor.visible = true;
             Cursor.lockState = CursorLockMode.None;
             GUILayout.BeginArea (new Rect (Screen.width / 2 - 250, Screen.height / 2 - 250, 500,500));
             GUILayout.Box("Score: " + PhotonNetwork.player.GetScore () + " \n \nBots: x" + curAis.Length + "\n");
             GUILayout.Box("Kills: " + PlayerPrefs.GetInt ("kills") + " | "  + "Deaths: " + PlayerPrefs.GetInt ("deaths") + " | K/D: " + kD)  ;
 
 
 
             if (GUILayout.Button ("Assault")) {
                 spawnPlayer(playerPref2.name);
             }
             if (GUILayout.Button ("SWAT")) {
                 spawnPlayer(playerPref.name);
             }
             if (GUILayout.Button ("Disconnect")) {
                 PhotonNetwork.Disconnect ();
                 Application.LoadLevel (0);
             }
             if (GUILayout.Button ("Spawn 2 Bots")) {
                 spawnAi ();
                 spawnAi ();
             }
             if (GUILayout.Button ("Delete Bot")) {
                 GameObject.Find("_NETWORKSCRIPTS").GetComponent<PhotonView>().RPC("deleteBot", PhotonTargets.AllBuffered, null);
             }
             GUILayout.EndArea ();
         }
     }
 }