Logowanie za pomocą danych z forum mybb Opcje

[kiepski96]

Mam forum i własną stronę,na tę swoją chciałbym logować się danymi z forum.
Tylko po podaniu tabeli z użytkownikami mybb wyskakuje błąd:

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Warning: mysql_fetch_array(): supplied argument is not a valid MySQL result resource in /home/nagrody/public_html/zlecenia/punktowicze/logowanie.php on line 19
 
Warning: Cannot modify header information - headers already sent by (output started at /home/nagrody/public_html/zlecenia/punktowicze/logowanie.php:19) in /home/nagrody/public_html/zlecenia/punktowicze/logowanie.php on line 30
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Mam takie logowanie na stronę,dane bazy ukryłem pod przypadkowymi literami :

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<?php
if($_SERVER['REQUEST_METHOD'] == 'POST')
{
   $success_page = '';
   $error_page = basename(__FILE__);
   $mysql_server = 'mvbm';
   $mysql_username = 'mvbm';
   $mysql_password = 'ncvn';
   $mysql_database = 'cfhb';
   $mysql_table = 'nvbm';
   $crypt_pass = md5($_POST['password']);
   $found = false;
   $fullname = '';
 
   $db = mysql_connect($mysql_server, $mysql_username, $mysql_password);
   mysql_select_db($mysql_database, $db);
   $sql = "SELECT password, fullname, active FROM ".$mysql_table." WHERE username = '".$_POST['username']."'";
   $result = mysql_query($sql, $db);
   if ($data = mysql_fetch_array($result))
   {
      if ($crypt_pass == $data['password'] && $data['active'] != 0)
      {
         $found = true;
         $fullname = $data['fullname'];
      }
   }
   mysql_close($db);
   if($found == false)
   {
      header('Location: '.$error_page);
      exit;
   }
   else
   {
      session_start();
      $_SESSION['username'] = $_POST['username'];
      $_SESSION['fullname'] = $fullname;
      header('Location: '.$success_page);
      exit;
   }
}
$username = isset($_COOKIE['username']) ? $_COOKIE['username'] : '';
$password = isset($_COOKIE['password']) ? $_COOKIE['password'] : '';
?>
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[kiepski96]

Poprawiłem kod na taki i po zalogowaniu wywala mi error.php,nie wiem dlaczego ?

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<?php
if($_SERVER['REQUEST_METHOD'] == 'POST')
{
   $success_page = './panel.php';
   $error_page = './error.php';
   $mysql_server = 'localhost';
   $mysql_username = 'xxx';
   $mysql_password = 'xxx';
   $mysql_database = 'xxx';
   $mysql_table = 'mybb_users';
   $crypt_pass = md5($_POST['password']);
   $found = false;
 
    $db = mysql_connect($mysql_server, $mysql_username, $mysql_password);
   mysql_select_db($mysql_database, $db);
   $sql = "SELECT password FROM ".$mysql_table." WHERE username = '".$_POST['username']."'";
   $result = mysql_query($sql, $db);
   if($data = mysql_fetch_array($result))
   {
      if ($crypt_pass == $data['password'])
      {
         $found = true;
      }
   }
   mysql_close($db);
   if($found == false)
   {
      @header('Location: '.$error_page);
      exit;
   }
   else
   {
      session_start();
      $_SESSION['username'] = $_POST['username'];
      $rememberme = isset($_POST['rememberme']) ? true : false;
      if ($rememberme)
      {
         setcookie('username', $_POST['username'], time() + 3600*24*30);
         setcookie('password', $_POST['password'], time() + 3600*24*30);
      }
      @header('Location: '.$success_page);
      exit;
   }
}
$username = isset($_COOKIE['username']) ? $_COOKIE['username'] : '';
$password = isset($_COOKIE['password']) ? $_COOKIE['password'] : '';
?>
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