Thumbs not showing - Wordpress

                    $args = array(
                        'showposts'         => 1,
                        'posts_per_page'    => 1,
                        'offset' => $featured_offset
                    );
                    $featured = new WP_Query($args);
                    if($featured -> have_posts()) : while($featured -> have_posts()) : $featured -> the_post();
                ?>
                <div class="post-featured">
                    <div class="the-thumbnail">
                        <?php
                            $args = array( 'post_type' => 'attachment', 'post_parent' => get_the_ID() );
                            $attachments = get_posts($args);
                            if ($attachments) {
                                $gambar = wp_get_attachment_image_src( $attachments[0]->ID, 'medium', false);
                        ?>
                                    <img src="<?php echo $gambar[0]?>" />
                        <?php
                            }
                        ?>
                    </div>