PHP Pharse error

Hi there, I'm trying to put a theme shortcode in my wordpress template file.

I'm getting the following error "Parse error: syntax error, unexpected 'echo' (T_ECHO) in /www/wp-content/themes/enfold/includes/loop-big6.php on line 30"

test website here

<?php
global $avia_config, $post_loop_count;

$post_loop_count= 1;
$post_class 	= "post-entry-".avia_get_the_id();



// check if we got posts to display:
if (have_posts()) :

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

		<article class='post-entry post-entry-type-page <?php echo $post_class; ?>' <?php avia_markup_helper(array('context' => 'entry')); ?>>

			<div class="entry-content-wrapper clearfix">
				
				<img class="vv" src="https://idgiyn5kp0-flywheel.netdna-ssl.com/wp-content/uploads/2018/04/CreteCarrier_OfficeBlueShirt-1500x430.jpg" alt="rr" width="100%" height="230px" />
				
				<?php if ( $apply = get_the_job_application_method() ) :
						if ( $apply->type === 'url' ) {
							$application_href = $apply->url;
						} elseif ( $apply->type === 'email' ) {
							$application_href = sprintf( 'mailto:%1$s%2$s', $apply->email, '?subject=' . rawurlencode( $apply->subject )  );
					} ?>
				<?php endif; ?>
				
				 <?php echo do_shortcode('[av_one_third first margin="0px" padding="0px" radius="0px" mobile_breaking="" mobile_display="" av_uid="av-y5kp57"] 
					 <a class="application_button button" href=" '. echo $application_href; .'" target="_blank"> Apply For Job </a> [/av_one_third] ');?>
					
					
					



				 

					<?php the_content(); ?>
					<?php the_field('job_main_content'); ?>
	
	
					<br /><br />
					<?php display_job_phonenumber_data(); ?>

				
				<?php
           
				
				wp_link_pages($avia_wp_link_pages_args);

				if(has_tag() && is_single())
				{
					echo '<span class="blog-tags minor-meta">';
					the_tags('<strong>'.__('Tags:','avia_framework').'</strong><span> ');
					echo '</span></span>';
				}
                echo '</footer>';

				?>
			</div>
						
		</article><!--end post-entry-->


<?php
	$post_loop_count++;
	endwhile;
	else:
?>

    <article class="entry">
        <header class="entry-content-header">
            <h1 class='post-title entry-title'><?php _e('Nothing Found', 'avia_framework'); ?></h1>
        </header>

        <?php get_template_part('includes/error404'); ?>

        <footer class="entry-footer"></footer>
    </article>

<?php

	endif;
?>

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