My theme page code

<?php get_header(); ?>
<div class="art-layout-wrapper">
    <div class="art-content-layout">
        <div class="art-content-layout-row">
            <div class="art-layout-cell art-content">
			<?php get_sidebar('top'); ?>
			<?php
				if(have_posts()) {

					/* Start the Loop */
					while (have_posts()) {
						the_post();
						get_template_part('content', 'page');
						/* Display comments */
						if ( theme_get_option('theme_allow_comments')) {
							comments_template();
						}
					}

				} else {

					 theme_404_content();

				}
		    ?>
			<?php get_sidebar('bottom'); ?>
              <div class="cleared"></div>
            </div>
            <div class="art-layout-cell art-sidebar1">
              <?php get_sidebar('default'); ?>
              <div class="cleared"></div>
            </div>
        </div>
    </div>
</div>
<div class="cleared"></div>
<?php get_footer(); ?>