Pagnation Not Working

Hello, I can not seem to get my pagnation working on the blog template php.

My code is as follows:

<?php
/**
 * Template Name: Blog
 */
get_header(); ?>
<div class="clear"></div>

</header> <!-- / END HOME SECTION  -->

<div id="content" class="site-content">

	<div class="container">

		<div class="content-left-wrap col-md-9">

			<div id="primary" class="content-area">

				<main id="main" class="site-main" role="main">
					<?php
					$paged = (get_query_var('paged')) ? get_query_var('paged') : 1;
					$wp_query = new WP_Query( array('post_type' => 'post', 'showposts' => '15', 'paged' => $paged) );

					if( $wp_query->have_posts() ):

						while ($wp_query->have_posts()) : 

							$wp_query->the_post();
							get_template_part( 'content', get_post_format() );

						endwhile;

					endif;

					zerif_paging_nav();

					wp_reset_postdata();
					?>
				</main><!-- #main -->

			</div><!-- #primary -->

		</div><!-- .content-left-wrap -->

		<div class="sidebar-wrap col-md-3 content-left-wrap">

			<?php get_sidebar(); ?>

		</div><!-- .sidebar-wrap -->

	</div><!-- .container -->
<?php get_footer(); ?>

The “Older Posts” link brings up a 404 error page not found. Any help would be greatly appreciated.