TRIBUTE TO THE VICTIMS ON THE 77TH ANNIVERSARY OF THE LIBERATION

Fatal error: Uncaught Error: DOMDocument::loadHTML(): Argument #1 ($source) must not be empty
in /var/www/html/wp-content/themes/understrap/inc/setup.php on line 135

Call stack:

1. DOMDocument::loadHTML()
   wp-content/themes/understrap/inc/setup.php:135
2. wpse_gallery_shortcode()
   wp-includes/class-wp-hook.php:324
3. WP_Hook::apply_filters()
   wp-includes/plugin.php:205
4. apply_filters()
   wp-includes/media.php:2703
5. gallery_shortcode()
   wp-includes/shortcodes.php:434
6. do_shortcode_tag()
7. preg_replace_callback()
   wp-includes/shortcodes.php:273
8. do_shortcode()
   wp-includes/class-wp-hook.php:324
9. WP_Hook::apply_filters()
   wp-includes/plugin.php:205
10. apply_filters()
    wp-includes/post-template.php:256
11. the_content()
    wp-content/themes/understrap/loop-templates/content-single.php:31
12. require('/var/www/html/wp-con...s/content-single.php')
    wp-includes/template.php:812
13. load_template()
    wp-includes/template.php:745
14. locate_template()
    wp-includes/general-template.php:206
15. get_template_part()
    wp-content/themes/understrap/single.php:17
16. include('/var/www/html/wp-con...nderstrap/single.php')
    wp-includes/template-loader.php:106
17. require_once('/var/www/html/wp-includes/template-loader.php')
    wp-blog-header.php:19
18. require('/var/www/html/wp-blog-header.php')
    index.php:17