Logging in via API by Snippet not working.

    // Are we logged in?
    $userId = $modx->user->get('username');

    if ($userId == '(anonymous)') { // No we are not... So Login

        $response = $modx->runProcessor(array(
            'action' => 'login',
            'location' => 'security',
            'username' => $casAttributes['user_id'],
            'password' => $casAttributes['password'],  
            'login_context' => 'web'
        ));

    }
    else { // Yes we are!
        echo 'Logged in, user already was here, user ID is ' . $userId;
    }

    require_once 'full-path-to-your/config.core.php';

    require_once MODX_CORE_PATH . 'model/modx/modx.class.php';

    $modx = new modX();
    $modx->initialize( 'web' );
    $modx->getService( 'error','error.modError' );

    $output  = $modx->runSnippet('Login');
    $errors  = $modx->getPlaceholder('errors');
	
    if ( $errors )
    {
        echo $errors;
    }
    else
    {
        echo 'success';
    }

// Handles the login of CAS
require_once $modx->getOption('login.core_path',null,$modx->getOption('core_path').'components/PHPCas/').'init.php';

//Default Password
$password = 'atestpassword';

$casAttributes = phpCas::getAttributes();

//Fetch the user from MODx/
$user = $modx->getObject('modUser', array('username'=>$casAttributes['user_id']));

if ($user) { //Have we grabbed the user? (Do they exist in MODx);
    // Yes this user already exists in MODx, lets now log them in...

    // Are we logged in?
    $userId = $modx->user->get('username');

    if ($userId == '(anonymous)') { // No we are not... So lets login

        $_POST['username'] = $casAttributes['user_id'];
        $_POST['password'] = $password; 
        $_POST['service'] = 'login';
        $_REQUEST['service'] = 'login';
        $scriptProperties['loginResourceId'] = 16;

        // All handled by the login snippet
        $modx->runSnippet('Login', $scriptProperties);

        //returns anonymous
        error_log ("USER NAME LOGGED IS : " . $modx->user->get('username'));

    }
    else { // Yes we are!
        echo 'Logged in, user already was here, user ID is ' . $userId;
    }

}