Fatal error: Uncaught Error: Call to undefined function the_ad()
in /var/www/html/wp-content/themes/mts_crypto/functions.php on line 3125

Call stack:

1. {closure}()
   wp-includes/class-wp-hook.php:305
2. WP_Hook::apply_filters()
   wp-includes/class-wp-hook.php:327
3. WP_Hook::do_action()
   wp-includes/plugin.php:470
4. do_action()
   wp-content/plugins/wp-review-pro/includes/widgets/class-wp-review-recent-reviews-widget.php:101
5. WP_Review_Recent_Reviews_Widget::widget()
   wp-includes/class-wp-widget.php:393
6. WP_Widget::display_callback()
   wp-includes/widgets.php:831
7. dynamic_sidebar()
   wp-content/themes/mts_crypto/header.php:259
8. require_once()
   wp-includes/template.php:770
9. load_template()
   wp-includes/template.php:716
10. locate_template()
    wp-includes/general-template.php:48
11. get_header()
    wp-content/themes/mts_crypto/single-website-review.php:16
12. include()
    wp-includes/template-loader.php:106
13. require_once()
    wp-blog-header.php:19
14. require()
    index.php:17