Notice: Undefined index

Notice: Undefined index: vcp in C:\wamp\www\Vote\index.php on line 27
Notice: Undefined index: act in C:\wamp\www\Vote\index.php on line 27

<?php

//Configuration

//Logon Database information.
define("LOGON_HOST","localhost");
define("LOGON_USER","*****");
define("LOGON_PASS","*****");
define("LOGON_DB","*****");
define("ENCRYPT_PASSWORDS",false); // !!! - Not yet supported

//Local webserver's MySQL information.
define("MYSQL_HOST","localhost");
define("MYSQL_USER","*****");
define("MYSQL_PASS","*****");
define("MYSQL_DB","*****");

//In game mail settings
define("MAIL_SUBJECT","Thanks For Voting!");
define("MAIL_BODY","Thank you for voting for our server. Here is your reward!");

// Misc
define("RPPV",1); // Reward points per vote. Must be a whole number.

session_start();
// force login to view.
if(!$_SESSION['vcp']['authenticated'] && $_GET['act'] != "vote")
{
include("pages/login.php");
new Login();
die;
}
switch($_GET['act'])
{
default:
include("pages/overview.php");
new Overview();
break;
case "rewards":
include("pages/rewards.php");
new Rewards();
break;
case "spend":
include("pages/spend.php");
new Spend();
break;
case "vote":
include("pages/vote.php");
new Vote();
break;
}
?>