Fatal error: Call to a member function prepare() on a non-object

    {
        $errors[] = 'Please fill in all fields';
    }

    if (empty($errors))
    {
        $SQLCheckLogin = $odb -> prepare("SELECT COUNT(*) FROM `users` WHERE `username` = :username AND `password` = :password");
        $SQLCheckLogin -> execute(array(':username' => $username, ':password' => SHA1($password)));
        $countLogin = $SQLCheckLogin -> fetchColumn(0);
        if ($countLogin == 1)
        {
            $SQLGetInfo = $odb -> prepare("SELECT `username`, `ID`, `status` FROM `users` WHERE `username` = :username AND `password` = :password");
            $SQLGetInfo -> execute(array(':username' => $username, ':password' => SHA1($password)));
            $userInfo = $SQLGetInfo -> fetch(PDO::FETCH_ASSOC);
            if ($userInfo['status'] == "0")
            {
                $_SESSION['username'] = $userInfo['username'];
                $_SESSION['ID'] = $userInfo['ID'];

                $ip = getRealIpAddr();
                    $SQL = $odb -> prepare('INSERT INTO `loginlogs` VALUES(:username, :ip, UNIX_TIMESTAMP(), "")');
                    $SQL -> execute(array(':ip' => $ip, ':username' => $username));
                    echo '<div class="alert alert-success"><center><p><font color=\'black\'>Login Succeed.  Redirecting....</font></p></center></div><meta http-equiv="refresh" content="3;url=index.php">';
                    die();


            }