[WP]Custom post type in un loop

[kodem]

Prova con:

<?php
$args = array( 'post_type' => 'offerte', 'posts_per_page' => 15 );
$loop = new WP_Query( $args );
while ( $loop->have_posts() ) : $loop->the_post();
echo  "<td>";
echo  stampatitolo();
echo  "<td>";
echo get_post_meta($post->ID, 'campo1', true);
echo  "<td>";
echo get_post_meta($post->ID, 'campo2', true);
echo "</tr>";
endwhile;
?>