Use GoDaddy Control Panel, File Manager and Search (Control-F) the Gallery Templates (gallery-single-template.php) & (gallery-template.php) and remove the line: <?php get_sidebar(); ?>
Look in public_html, find wp-contents folder\themes\tempera
If the files don’t exist in the tempera folder, copy them from the public_html/wp-content/plugins/gallery-plugin/templates folder.