PHP – warning: Illegal string offset in custom WordPress theme

I’m trying to fix a custom WordPress theme I didn’t write. My limited PHP knowledge can’t figure this out. My exhaustive search have found similar questions with most of the answers say the array is passing a string or wrong type. I just don’t know how to fix it, or maybe I just should suppress the warning?

Warning: Illegal string offset ‘the_link’ on line 39
Warning: Illegal string offset ‘subheader’ on line 58

Here’s the code in question. Any help would be greatly appreciated.

    <?php get_header(); ?>
    <?php wp_nav_menu( array( 'container_class' => 'header-bar','theme_location' => 'reviews' ) ); ?>

<div class="content wiemer-pages">
  <?php the_post(); ?>
  <div id="page-header-wrap">
<div id="page-header" class="no-shadow wreath">
  <?php the_post_thumbnail(); ?>
  <h1 class="page-title">
    <?php the_title(); ?>
  </h1>
  <div id="page-header-content">
    <?php $pageheader_metabox->the_meta(); 
$pageheader_metabox->the_value('title');?>
  </div>
  <div class="clear"></div>
</div>
  </div>
  <!-- [END] page-header-wrap + page header -->
  <div class="page-content">
<?php the_content(); ?>
<?php edit_post_link(); ?>
  </div>
  <?php   
$args=array(
   'post_type'=>'reviews',  
'posts_per_page'=>60
);
$catreview = new WP_Query($args);
global $post;
   ?>
  <?php if($catreview->have_posts()): ?>
  <h2 class="review-category" id="accolades">Recent Accolades </h2>
  <?php while ($catreview->have_posts()) : $catreview->the_post();?>
  <?php // load the meta     
        $mainurl='#';
    $meta= get_post_meta($post->ID, '_urls', true);
             $mainurl = $meta['the_link']; <!-- line 39 -->
     ?>

  <div class="review-item">
<div class="review-thumb-container">
  <?php // post thumbnail 
            if (has_post_thumbnail()){  ?>
  <a class="review-thumbnail" href="<?php echo $mainurl ?>">
  <?php the_post_thumbnail(array(144,180),array("title" => get_the_title($post->ID) . " - Thumbnail")); ?>
  </a>
  <?php } ?>
</div>
<div class="review-body">
  <h6>
    <?php the_time('F Y') ?>
    <?php //echo get_the_term_list( $post->ID, 'accolades', '| '); ?>
  </h6>
  <h3><a href="<?php echo $mainurl; ?>">
    <?php the_title() ?>
    </a></h3>
  <?php if ($sh = $meta['subheader']){ echo "<h4> $sh </h4>"; } ?>  <!-- line 58 -->
  <div class="review-content">
    <?php the_content(); ?>
    <?php edit_post_link( 'Edit', '<div class="edit-link">', '</div>' ); ?>
  </div>
  <?php if (isset($meta['link_title'])): ?>
  <ul class="url-list">
    <li> <a href="<?php echo $meta['the_link']; ?>" class="note-cat">
<?php echo $meta['link_title']; ?></a> </li>
  </ul>
  <?php endif; //urls ?>
</div>
</div>
<?php endwhile; ?>
<p><a class="to-top" title="Top of the page" href="#masthead">Top&uarr;</a></p>
<?php endif; //End if for Accolades ?>
</div>
<?php get_footer(); ?>