the_title not working

I’m using the_title() to show the title of a custom post type, but it’s not working; the title does not show.

get_header();
$wp_query = new WP_Query();
$wp_query -> query('post_type=press&showposts=20');
while ($wp_query->have_posts()) : 
    $wp_query->the_post(); ?>
    <div class="press-item">
        <div class="press-img"><?php the_post_thumbnail('medium');?></div>
        <div class="press-content">
            <div class="press-title"><?php the_title(); ?> </div>
            <div class="press-excerpt"><?php the_excerpt(); ?> </div>
        </div>
    </div>
<?php endwhile;
get_footer();

Solutions Collecting From Web of "the_title not working"