the_content not showing on attachment.php

Hello,

I am happy using your themes Ligonberry but I am having some problem, I want the_content is showing on attachment.php or image.php, I’ve tried to change the code
<?php if(have_posts()) : while(have_posts()) : the_post(); ?>
<?php the_content(); ?>
<?php endwhile; endif; ?>

but it still won work, if someone can help this,I would like appreciate.

Thank you