player Spawning Error on Photon (PhotonNetwork.Instantiate)

Here is My Script;

using Photon.Pun;
using UnityEngine;

namespace TestingPhoton
{
public class ComePlyr : MonoBehaviour
{
[Tooltip(“The prefab to use for representing the player”)]
public GameObject playerPrefab;

    void Start() {
        if (playerPrefab == null)
        {
            Debug.LogError("<Color=Red><a>Missing</a></Color> playerPrefab Reference. Please set it up in GameObject 'Game Manager'", this);
        }
        else
        {
            // we're in a room. spawn a character for the local player. it gets synced by using PhotonNetwork.Instantiate
            PhotonNetwork.Instantiate(playerPrefab.name, transform.position * Random.Range(0, 2), Quaternion.identity);
        }
    }
}

}

in the Editor Showing error on Join GameRoom
1[DefaultPool failed to load “player” . Make sure it’s in a “Resources” folder.
UnityEngine.Debug:LogError(Object)]
2[NullReferenceException: Object reference not set to an instance of an object]

Photon.Pun.DefaultPool.Instantiate (System.String prefabId, UnityEngine.Vector3 position, UnityEngine.Quaternion rotation) (at Assets/Photon/PhotonUnityNetworking/Code/PunClasses.cs:997)
Photon.Pun.PhotonNetwork.NetworkInstantiate (Photon.Pun.InstantiateParameters parameters, System.Boolean sceneObject, System.Boolean instantiateEvent) (at Assets/Photon/PhotonUnityNetworking/Code/PhotonNetwork.cs:2447)
Photon.Pun.PhotonNetwork.Instantiate (System.String prefabName, UnityEngine.Vector3 position, UnityEngine.Quaternion rotation, System.Byte group, System.Object data) (at Assets/Photon/PhotonUnityNetworking/Code/PhotonNetwork.cs:2346)
TestingPhoton.ComePlyr.Start () (at Assets/Script/ComePlyr.cs:19)

in Unity
I Try in
//Diffrents of Way
//Use other Script
//change, Create New Project
//Try to Diffrent unity Version
out of three Days Showing Error and show same error !Please Give Your Answer&Openion Please

May you have to create a folder which must be called “Resources” then drop there your character prefab and run the game.