PHP Gmail API Invalid Grant: Code was already redeemed (Codeigniter) - php

Question

First of all I want to say that I read all the other post about this same problem and I couldn't find a solution.
This is the error:
exception 'Google_Auth_Exception' with message 'Error fetching OAuth2 access token, message: 'invalid_grant: Code was already redeemed.
In localhost, it works perfect. I can debug it and I get Google plus && emails info without problem.
I create a new credential for production (Web App) and I set my oauth return uri in: Authorized redirect URI
(http://www.__myweb_.com/plus_gmail/oauth2callback)
It works, because I can accept and I get the code in callback, but it fails when I try to authenticate;
I also tried to revokeToken and my Session is empty...
How can I solve this problem??
Thanks a lot!!
This is my code:
function __construct()
{
define('CLIENT_SECRET_PATH', 'client_secret_online.json');
$this->redirect_url=base_url()."plus_gmail/oauth2callback";
$this->client = new Google_Client();
$this->client->setIncludeGrantedScopes(true);
$this->client->setAuthConfigFile(CLIENT_SECRET_PATH);
$this->client->addScope(Google_Service_Plus::PLUS_LOGIN);
$this->client->addScope(Google_Service_Plus::PLUS_ME);
$this->client->addScope(Google_Service_Plus::USERINFO_EMAIL);
$this->client->addScope(Google_Service_Plus::USERINFO_PROFILE);
$this->client->addScope(Google_Service_Gmail::MAIL_GOOGLE_COM);
$this->client->setRedirectUri($this->redirect_url);
$this->client->setAccessType('offline');
$this->client->setIncludeGrantedScopes(true);
}
function index()
{
$auth_url = $this->client->createAuthUrl();
header('Location: ' . filter_var($auth_url, FILTER_SANITIZE_URL));
}
function oauth2callback()
{
if (! isset($_GET['code']))
{
echo "Error getting code"
}
else
{
$token=$_GET['code'];
$data["token"]=$token;
try
{
$this->client->authenticate($token);
$access_token = $this->client->getAccessToken();
$plus = new Google_Service_Plus($this->client);
$me=$plus->people->get('me');
$this->daouser->newUserPlus($me,$access_token);
var_dump($me);
$this->readEmailsId($this->client);
}
catch (Exception $e)
{
var_dump($e)
}
}
}
I also need to know why it shows me the var_dump($e), but I have a new row in my database withe user google plus info.
I delete access to my app in my gmail account (https://security.google.com/settings/security/permissions) and give access again getting the same error (Code was already redeemed). I used a new gmail account and I get also the same error...