As far as I can see there is no widget area on the front/gallery page.
If you look in page.php in the theme it ends with:
<?php get_sidebar(); ?>
<?php get_footer(); ?>
And the gallery template(ds-gallery-template.php) only ends with:
<?php get_footer(); ?>
So if you add <?php get_sidebar(); ?>
just before <?php get_footer(); ?>
you will be okay. Lycka till!