Help my posts are gone

i was trying to add sumble it link into posts and i messed it all up !
here is my single.php
there seems to be some problem my single posts are now giving error when clicked you can chek the problem by clicking on any post
https://www.aivault.com

here is my single.php
anyone can fix for me plzzzzzzzzzzzzzzzz

<?php get_header(); ?><div id="post"><?php if(have_posts()) : ?><script src="https://feeds.feedburner.com/~s/Aivault?i=<?php the_permalink() ?>" type="text/javascript" charset="utf-8"></script><?php while(have_posts()) : the_post(); ?><div class="post-meta" id="post-<?php the_ID(); ?>"><h1><?php the_title(); ?></h1><div class="author">posted by <?php the_author_posts_link(); ?> in <?php the_time('F jS, Y') ?>&nbsp;<?php edit_post_link(__(' Edit'), '|', ''); ?></div><div class="post-cat">in <?php the_category(', ') ?>&nbsp;&nbsp;<?php if(function_exists("UTW_ShowTagsForCurrentPost")) : ?><?php UTW_ShowTagsForCurrentPost("commalist", array('last'=>' and %taglink%', 'first'=>'Tags: %taglink%',)) ?><?php else : ?><?php if(function_exists("the_tags")) : ?><?php the_tags() ?><?php endif; ?><?php endif; ?></div><div class="post-content"><?php the_content("Continue reading &rarr;"); ?></div><?php get_social(); ?>