Code ERROR CS0115

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using Photon.Pun;
using Photon.Realtime;

public class PixelGunGameManager : MonoBehaviourPunCallbacks
{

    [SerializeField]
    GameObject playerPrefab;






    // Start is called before the first frame update
    void Start()
    {

        if (PhotonNetwork.IsConnected)
        {
            if (playerPrefab!=null)
            {
              int randomPoint = Random.Range(-20, 20);

              PhotonNetwork.Instantiate(playerPrefab.name, new Vector3(randomPoint,0,randomPoint),Quaternion.identity);
            }

        }

    }

    // Update is called once per frame
    void Update()
    {

    }
    public override void OnJoinedRoom()
    {
        Debug.Log(PhotonNetwork.NickName + " joined to " + PhotonNetwork.CurrentRoom.Name);

    }
    public override void OnPlayerEnteredRoom(Player newPlayer)
    {
        Debug.Log(newPlayer.NickName + " joined to " + PhotonNetwork.CurrentRoom.Name + " " + PhotonNetwork.CurrentRoom.PlayerCount);
    }
}