function OnFailedToConnectToMasterServer(info : NetworkConnectionError) {
    Debug.Log("Could not connect to master server: "+ info);
}

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
    void OnFailedToConnectToMasterServer(NetworkConnectionError info) {
        Debug.Log("Could not connect to master server: " + info);
    }
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

    def OnFailedToConnectToMasterServer(info as NetworkConnectionError):
        Debug.Log(('Could not connect to master server: ' + info))