Show posts from custom taxonomy

Hi,

I’ve been going at this for the last couple of hours. Maybe someone here can help me?

I want to show specif posts from a custom taxonomy in a loop.
This is the situation:

– custom taxonomy: feestlocaties
– And the the posts i want to show have Amsterdam selected (checked) (like categories).

Code i tried:

<?php  $args=array(
    'taxonomy' => 'feestlocaties',
    'terms' => array('Amsterdam'),
    'field' => 'slug',
    'orderby'=> 'rand',
    );
?>

But nothing is showing. Any help would be great. Thanks!