PHP, Codebird and Twitter why am receiving error 401 Invalid Request Token

I am trying to get access token from twitter using codebird, first getting user to authorize use of my application works perfectly using this code

    require_once('lib/codebird.php');

\Codebird\Codebird::setConsumerKey("xxx", "xxxx");
$cb = \Codebird\Codebird::getInstance();
session_start();
    // get the request token
    $reply = $cb->oauth_requestToken(array(
        'oauth_callback' => 'http://ift.tt/1H1oC39'));
    // store the token
    $cb->setToken($reply->oauth_token, $reply->oauth_token_secret);
    $_SESSION['oauth_token'] = $reply->oauth_token;
    $_SESSION['oauth_token_secret'] = $reply->oauth_token_secret;
    $_SESSION['oauth_verify'] = true;

    // redirect to auth website
    $auth_url = $cb->oauth_authorize();
?>
    <script type="text/javascript">
        window.location = "<?php echo  $auth_url; ?>";
    </script>

<?php
    //header('Location: ' . $auth_url);
?>

This is where I am redirected here:

When then I get redirected to the window in where I am supposed to get the access token and access token secret and that also works.

Here is where using $_GET[] I get the following codes http://ift.tt/1H1oAZ9

Now in that page when I run the following code, it does not work, but produces the following error:

require_once('lib/codebird.php');
session_start();
\Codebird\Codebird::setConsumerKey("xxxx", "xxxx");
$cb = \Codebird\Codebird::getInstance();
// get the access token
$reply = $cb->oauth_accessToken(array(
        'oauth_verifier' => $_GET['oauth_verifier']
));

var_dump($reply);

When I dump the reply, it has the following error in it:

object(stdClass)#1 (3) { ["message"]=> string(21) "Invalid request token" ["httpstatus"]=> int(401) ["rate"]=> NULL }

So how am I supposed to get the aouth_accessToken, with this oauth_token=zzzzz&oauth_verifier=zzzz url parameters provide and a user has authorised use of my application?