get_posts() problem..the_title() is not showing.

I have been following this page and coded get_post()

http://codex.wordpress.org/Template_Tags/get_posts

$args = array(
	'posts_per_page'  => 15,
	'numberposts'     => 15,
	'offset'          => 0,
	'category'        => '',
	'orderby'         => 'id',
	'order'           => 'DESC',
	'include'         => '',
	'exclude'         => '',
	'meta_key'        => '',
	'meta_value'      => '',
	'post_type'       => 'custom-post-type',
	'post_mime_type'  => '',
	'post_parent'     => '',
	'post_status'     => 'publish',
	'suppress_filters' => true );

$myposts = get_posts( $args );

foreach( $myposts as $post ) : setup_postdata($post); ?>

<li>(<?php the_ID(); ?>)
		<?php the_date(); ?>
          <a>"><?php the_title(); ?></a>
  		<?php the_excerpt(); ?>

</li>
<?php endforeach; ?>

this is “custom post type” single pages. and I want to create relative posts bottom of this single pages. but except the_excerpt(), it displays the current page information. all same result values, except excerpt.

any solution? I am not supposed to use the post() on single pages?

actually, I am trying to get category = 11 posts only. but if I do “category=11”, then nothing shows.

any tips?