How to get player game objects of network on server?


I am trying to understan networking api in Unity. My aim is to get players’ gameobjects on server to locate positions of player objects of all clients. I wrote following script for my purpose.

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Networking;

public class PlayerPositionBroadcaster : NetworkBehaviour

    static List<GameObject> players;

	// Use this for initialization
	void Awake () {

        if (!isClient)
            players = new List<GameObject>();
            Debug.Log("Creating new players list");


    public override void OnStartClient() {
        Debug.Log("on start client");

        if (!isServer)


    void OnConnectedToServer()
        Debug.Log("Conntected to server");

    void CmdRegisterPlayer(GameObject player)
        Debug.Log("Registering player");
        if (!isClient) players.Add(player);


My purpose was creating a list of players in server script. And make clients to register to that list when they connected to server. I made that registration with a command. Note that this script is attached to player object.

But this script gives “Trying to send command for object without authority.” error.

I am wondering what is the most efficient way to get players of clients on server?

I am also trying to achieve the same thing
Maybe you can use
GameObject.Find(“Playerprefab_name (” + int.Tostring() + “)”)

Then int++;
It should work in theory