Related post - Custom taxonomy and Custom post type

gistfile1.php

<div class="related-posts">
	<?php
		$terms = get_the_terms( $post->ID , 'genero'); //genero é a taxonomia que criei aqui

		if ( $terms && ! is_wp_error( $terms ) ) { 
			$slugs = array();
			foreach ( $terms as $term ) {
				$slugs[] = $term->term_id;
			}
		}

		$args = array(
			'post_type' =>'filme',
			'tax_query' => array(
				array(
					'taxonomy' => 'genero',
					'terms'    => $slugs,
				),
			),
	        'showposts' => 5,
	        'caller_get_posts' => 1,
	        'post__not_in' => array($post->ID)
	    );

		$my_query = new WP_Query($args); 

		if( $my_query->have_posts() ) { 
			echo '<h3>Related Posts</h3><ul>'; 
			while ($my_query->have_posts()) { 
				$my_query->the_post(); ?> 
				<li><a href="<?php the_permalink() ?>" rel="bookmark" title="Permanent Link to <?php the_title_attribute(); ?>"><?php the_title(); ?></a></li> 
		  <?php } 
			echo '</ul>'; 
		} ?>
</div>