Parse error Unexpected endif line 35

<?php get_header(); ?>

<section class="two-column row no-max pad">
      <div class="small-12 columns">
        <div class="row">
          <!-- Primary Column -->
          <div class="small-12 medium-7 medium-offset-1 medium-push-4 columns">
            <div class="primary">

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

      <article class="post">
                <h1><a href="<?php the_permalink(); ?>"><?php the_title(); ?></a></h1>
                <h2><?php the_excerpt(); ?></h2>
                <ul class="post-meta no-bullet">
                  <li class="author">
                    <a href="author.html">
                      <span class="wpt-avatar small">
                        <?php echo get_avatar( get_the_author_meta( 'ID'), 24 ); ?>
                      </span>
                      by <?php the_author_posts_link(); ?>
                    </a>
                  </li>
                  <li class="cat">in <?php the_category(); ?></li>
                  <li class="date">in <?php the_date(); ?></li>
                </ul>

                <?php if( the_post_thumbnail() ): ?>
                <div class="img-container">
                  <?php the_post_thumbnail('large'); ?>

                </div>
                <?php endif; ?>
                </article>

    <?php endwhile; else : ?>

      <p><?php _e( 'Bummer, nothing to see here.', 'treehouse-portfolio' ); ?></p>

    <?php endif; ?>
            </div>

        </div>

<!-- Secondary Column -->
    <div class="small-12 medium-4 medium-pull-8 columns">
    <div class="secondary">
        <h2 class="module-heading">Sidebar</h2>
              </div>
  </div>
</section>

<?php get_footer(); ?>