<?php

$the_slug = get_query_var('pid');

if ($the_slug){

if ( $post = get_page_by_path( $the_slug, OBJECT, 'myposttype' ) )
    $id = $post->ID;
else
    $id = 0;
?>

<?php get_header(); ?>
<div class="warpper">



    <?php ;
    $args = array(
        'name'        => $the_slug,
        'post_type'   => 'myposttype',
        'post_status' => 'publish',
        'numberposts' => 1,
    );
    $query = new WP_Query( $args );
    if ( $query->have_posts() ) :   while ( $query->have_posts() ) : $query->the_post();    ?>

<?php the_title(); ?>

<?php endwhile; else: ?><?php endif; ?>
<php } else{...};