Product Results page 500 error (WordPress)

Hello,

My products results page is giving me a 500 internal server error. Can anyone give me any advice as to why?

Link: https://bit.ly/2ae8gFV2

This is from the page throwing the error:

<?php
/**
 * The Template for displaying product archives, including the main shop page which is a post type archive
 *
 * This template can be overridden by copying it to yourtheme/woocommerce/archive-product.php.
 *
 * HOWEVER, on occasion WooCommerce will need to update template files and you (the theme developer).
 * will need to copy the new files to your theme to maintain compatibility. We try to do this.
 * as little as possible, but it does happen. When this occurs the version of the template file will.
 * be bumped and the readme will list any important changes.
 *
 * @see 	    https://docs.woothemes.com/document/template-structure/
 * @author 		WooThemes
 * @package 	WooCommerce/Templates
 * @version     2.0.0
 */

if ( ! defined( 'ABSPATH' ) ) {
	exit; // Exit if accessed directly
}

$page_id = wc_get_page_id( 'shop' );

$style = (comet_meta($page_id, 'page_title_style') != '') ? comet_meta($page_id, 'page_title_style') : 'grey' ;
$text_align = (comet_meta($page_id, 'title_text_align') != '') ? comet_meta($page_id, 'title_text_align') : '';
$text_transform = (comet_meta($page_id, 'title_text_transform') != '') ? comet_meta($page_id, 'title_text_transform') : '';
$page_title = (comet_meta($page_id, 'page_title') != '') ? comet_meta($page_id, 'page_title') : get_the_title($page_id);
$page_subtitle = (comet_meta($page_id, 'page_subtitle') != '') ? comet_meta($page_id, 'page_subtitle') : '';
$columns_layout = ( isset( $_GET['col'] ) && in_array( $_GET['col'], array( '2', '3', '4' ) ) ) ? $_GET['col'] : '';
$get_sidebar_var = ( isset($_GET['sidebar']) && $_GET['sidebar'] == 'off' ) ? false : true;

get_header( 'shop' ); ?>
<article id="<?php echo esc_html($post->post_name); ?>" class="page-single">
	<?php if (comet_meta($page_id, 'show_page_title') != '' && comet_meta($page_id, 'show_page_title') != 'no'): ?>
  <section class="page-title <?php echo esc_attr($style); ?>">

    <?php if (comet_meta($page_id, 'page_title_style') != '' && comet_meta($page_id, 'page_title_style') == 'parallax'): ?>
      <div class="parallax-bg" data-parallax="scroll" data-image-src="<?php echo esc_url(comet_meta($page_id, 'title_bg')); ?>"></div>
    <div class="parallax-overlay">
    <?php endif ?>

      <div class="centrize">
        <div class="v-center">
          <div class="container">
            <div class="title <?php echo esc_attr($text_align); ?>">
              <h1 class="<?php echo esc_attr($text_transform); ?>"><?php echo esc_attr($page_title); ?><span class="red-dot"></span></h1>
              <h4><?php echo esc_attr($page_subtitle); ?></h4>
              <hr>
            </div>
          </div>
        </div>
      </div>

    <?php if (comet_meta($page_id, 'page_title_style') != '' && comet_meta($page_id, 'page_title_style') == 'parallax'): ?>
    </div>
    <?php endif ?>
 	</section>
  <?php endif ?>

		<?php
			/**
			 * woocommerce_before_main_content hook.
			 *
			 * @hooked woocommerce_output_content_wrapper - 10 (outputs opening divs for the content)
			 * @hooked woocommerce_breadcrumb - 20
			 */
			do_action( 'woocommerce_before_main_content' );
		?>

		<?php if (comet_options('shop_sidebar') && $get_sidebar_var): ?>
			<div class="row">
	  		<?php /*?><div class="col-md-3 hidden-sm hidden-xs">
	  			<div id="sidebar">
	  				<?php dynamic_sidebar('shop_sidebar'); ?>
	  			</div>
	  		</div><?php */?>
	  		<div class="col-md-12">
  	<?php endif ?>

		<?php
			/**
			 * woocommerce_archive_description hook.
			 *
			 * @hooked woocommerce_taxonomy_archive_description - 10
			 * @hooked woocommerce_product_archive_description - 10
			 */
			do_action( 'woocommerce_archive_description' );
		?>
<!--<h1 class="hydrochloride">Product search results for 'hydrochloride'</h1>-->
		<?php if ( have_posts() ) : ?>
			<div class="shop-menu">
				<?php
					/**
					 * woocommerce_before_shop_loop hook.
					 *
					 * @hooked woocommerce_result_count - 20
					 * @hooked woocommerce_catalog_ordering - 30
					 */
					do_action( 'woocommerce_before_shop_loop' );
				?>
			</div>
            <div class="cas-row">
			 <div class="pro-name">Product Name</div>
                        <div class="cas-mane">CAS#</div></div>
		<?php if ($columns_layout || comet_options('shop_columns')): ?>
      <?php $col_width = ($columns_layout) ? $columns_layout : comet_options('shop_columns') ; ?>
			<div class="columns-<?php echo esc_attr( $col_width ); ?>">
		<?php endif ?>
				<?php woocommerce_product_loop_start(); ?>

					<?php woocommerce_product_subcategories(); ?>

					<?php while ( have_posts() ) : the_post(); ?>

						<?php //wc_get_template_part( 'content', 'product' ); ?>

                        <div class="enqaer">

                        <ul ><li class="them-mail"><a href="<?php echo get_permalink(); ?>"><?php echo get_the_post_thumbnail(); ?></a></li>

                        <div class="show">
  <li class="prod-title"><a href="<?php echo get_permalink(); ?>"><?php the_title();?></a> </li>

 <li class="product-name"><?php   the_field ('product_name_'); ?>  </li>

<?php /*?>  <li class="cas"><?php the_field ('sq'); ?> </li> <?php */?>
  <li class="cas hidden_cas">	<?php
				/**
				 * woocommerce_single_product_summary hook.
				 *
				 * @hooked woocommerce_template_single_meta - 40
				 */
				do_action( 'woocommerce_single_product_summary' );
			?></li>

 <li class="product-info"><a href="<?php the_permalink();?>"> Product info</a> </li>

  <li class="product-about"><a href="<?php echo get_site_url()?>/inquire/<?php echo '?proid='.get_the_id(); ?>">   Inquire about this product >></a></li>
  </div></ul>
                </div>

					<?php endwhile; // end of the loop. ?>
 <div class="container">
    <div class="green-serch">
    <div class="colam-serch">
  <h4>Search products by name or CAS#:</h4>
<form role="search" method="get" class="woocommerce-product-search" action="<?php echo esc_url( home_url( '/'  ) ); ?>">
	<label class="screen-reader-text" for="s"><?php _e( 'Search for:', 'woocommerce' ); ?></label>
	<input type="search" class="search-field" placeholder="<?php echo esc_attr_x( 'Search Products&hellip;', 'placeholder', 'woocommerce' ); ?>" value="<?php echo get_search_query(); ?>" name="s" title="<?php echo esc_attr_x( 'Search for:', 'label', 'woocommerce' ); ?>" />
    <div class="green-btn">
	<input type="submit" value="<?php echo esc_attr_x( 'Search', 'submit button', 'woocommerce' ); ?>" />
	<input type="hidden" name="post_type" value="product" />
    </div>
</form>
</div>
</div>
</div>
				<?php woocommerce_product_loop_end(); ?>
		<?php if ($columns_layout || comet_options('shop_columns')): ?>
			</div>
		<?php endif ?>

			<?php
				/**
				 * woocommerce_after_shop_loop hook.
				 *
				 * @hooked woocommerce_pagination - 10
				 */
				do_action( 'woocommerce_after_shop_loop' );
			?>

		<?php elseif ( ! woocommerce_product_subcategories( array( 'before' => woocommerce_product_loop_start( false ), 'after' => woocommerce_product_loop_end( false ) ) ) ) : ?>

			<?php wc_get_template( 'loop/no-products-found.php' ); ?>

		<?php endif; ?>

	<?php if (comet_options('shop_sidebar') && $get_sidebar_var): ?>
			</div>
		</div>
	<?php endif ?>

	<?php
		/**
		 * woocommerce_after_main_content hook.
		 *
		 * @hooked woocommerce_output_content_wrapper_end - 10 (outputs closing divs for the content)
		 */
		do_action( 'woocommerce_after_main_content' );
	?>

</article>

<?php get_footer( 'shop' ); ?>
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