What does "get_name can only be called from the main thread" mean 5.4.0b14

Questions & Answers
1

Having problems getting client socket code working in 5.4 that works fine in Unity4. Get the above error in 5.4.0b14 and “EnsureRunningOnMainThread can only be called from the main thread.” in b13. Code follows any suggestions very welcome.

using UnityEngine;
using System.Collections;
using System;
using System.Net;
using System.Net.Sockets;
using System.Text;

public class AsynchClient : MonoBehaviour
{

private Socket _clientSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
private byte[] _recieveBuffer = new byte[8142];
public UITextList textList;

void Awake()
{
    SetupServer();
}

private void SetupServer()
{
    string host = "127.0.0.1";
    int port = 8888;

    IPHostEntry hostEntry = null;
    hostEntry = Dns.GetHostEntry(host);

    foreach (IPAddress address in hostEntry.AddressList)
    {
        IPEndPoint ipe = new IPEndPoint(address, port);
        try
        {
            _clientSocket.Connect(ipe);
        }
        catch (SocketException ex)
        {
            Debug.Log(ex.Message);
        }

        if (_clientSocket.Connected)
        {
            _clientSocket.BeginReceive(_recieveBuffer, 0, _recieveBuffer.Length, SocketFlags.None, new AsyncCallback(ReceiveCallback), null);

            break;
        }
        else
        {
            continue;
        }
    }
}

private void ReceiveCallback(IAsyncResult AR)
{
    //Check how much bytes are recieved and call EndRecieve to finalize handshake
    int recieved = _clientSocket.EndReceive(AR);

    if (recieved <= 0)
        return;

    //Copy the recieved data into new buffer , to avoid null bytes
    byte[] recData = new byte[recieved];
    Buffer.BlockCopy(_recieveBuffer, 0, recData, 0, recieved);

    //Process data here the way you want , all your bytes will be stored in recData
    textList.Add(Encoding.ASCII.GetString(_recieveBuffer, 0, _recieveBuffer.Length));

    //Start receiving again
    _clientSocket.BeginReceive(_recieveBuffer, 0, _recieveBuffer.Length, SocketFlags.None, new AsyncCallback(ReceiveCallback), null);
}
2

Can you post the source of UITextList?

ReceiveCallback is called in a different thread (by Mono). You are not allowed to use any Unity functionality from a different thread and maybe, you are accessing some UI label or anything Unity-related within UITextList.Add ?