Retrive post by tags PHP code

Hy i am tring to use this code to retrive the related content hy post.

Ex:
The Post – are the movies…
Other Post_Type – is persoane

register_taxonomy("lista","persoane", array("hierarchical" => true, "label" => "Categorie", 'show_ui' => true, 'query_var' => true, "singular_label" => "lista", "rewrite" => true , 'with_front' => true));

The Code

<?php
		//for in the loop, display all "content", regardless of post_type,
		//that have the same custom taxonomy (e.g. genre) terms as the current post
		$found_none = '<h2>No related posts found!</h2>';
		$taxonomy = 'lista';//  e.g. post_tag, category, custom taxonomy
		$param_type = ''; //  e.g. tag__in, category__in, but genre__in will NOT work
		$tax_args=array('orderby' => 'date');
		$tags = wp_get_post_terms( $post->ID , $taxonomy, $tax_args);
			if ($tags) {
				foreach ($tags as $tag) {

    			$args=array(
    			$param_type => $tag->slug,
    			'post__not_in' => array($post->ID),
    			'post_type' => 'post',
    			'showposts'=> 1,
    			'caller_get_posts'=> 1
    			);

    		$my_query = null;
    		$my_query = new WP_Query($args);
    		if( $my_query->have_posts() ) {
    		while ($my_query->have_posts()) : $my_query->the_post(); ?>
    		<h3><a href="<?php the_permalink() ?>" rel="bookmark" title="<?php the_title(); ?>"><?php the_title(); ?></a></h3>
    		<?php $found_none = '';
    		endwhile;
    		}
    	}
    }
    wp_reset_query(); // to use the original query again
    ?>

I put in post,normal post of wordpress the tag Bruce Willis
It shoud display the movie that actor Will Smith play in… wath i am doing rong.

Thanks