Fatal Error when duplicating page

Anytime I try to duplicate a page the following fatal error shows up:

Fatal error: Uncaught Error: Call to a member function get_css_wrapper_selector() on bool in /home/customer/www/stacic1.sg-host.com/public_html/wp-content/plugins/elementor/core/settings/page/model.php:104 Stack trace: #0 /home/customer/www/stacic1.sg-host.com/public_html/wp-content/plugins/elementor/core/settings/base/css-manager.php(116): Elementor\Core\Settings\Page\Model->get_css_wrapper_selector() #1 /home/customer/www/stacic1.sg-host.com/public_html/wp-includes/class-wp-hook.php(308): Elementor\Core\Settings\Base\CSS_Manager->add_settings_css_rules(Object(Elementor\Core\Files\CSS\Post)) #2 /home/customer/www/stacic1.sg-host.com/public_html/wp-includes/class-wp-hook.php(332): WP_Hook->apply_filters(”, Array) #3 /home/customer/www/stacic1.sg-host.com/public_html/wp-includes/plugin.php(517): WP_Hook->do_action(Array) #4 /home/customer/www/stacic1.sg-host.com/public_html/wp-content/plugins/elementor/core/files/css/base.php(666): do_action(‘elementor/css-f…’, Object(Elementor\Core\Files\CSS\Post)) #5 /home/customer/www/stacic1.sg-host.com/public_html/wp-content/plugins/elementor/core/files/base.php(180): Elementor\Core\Files\CSS\Base->parse_content() #6 /home/customer/www/stacic1.sg-host.com/public_html/wp-content/plugins/elementor/core/files/css/base.php(130): Elementor\Core\Files\Base->update_file() #7 /home/customer/www/stacic1.sg-host.com/public_html/wp-content/plugins/duplicate-page/duplicatepage.php(226): Elementor\Core\Files\CSS\Base->update() #8 /home/customer/www/stacic1.sg-host.com/public_html/wp-content/plugins/duplicate-page/duplicatepage.php(122): duplicate_page->duplicate_edit_post(5) #9 /home/customer/www/stacic1.sg-host.com/public_html/wp-includes/class-wp-hook.php(308): duplicate_page->dt_duplicate_post_as_draft(”) #10 /home/customer/www/stacic1.sg-host.com/public_html/wp-includes/class-wp-hook.php(332): WP_Hook->apply_filters(”, Array) #11 /home/customer/www/stacic1.sg-host.com/public_html/wp-includes/plugin.php(517): WP_Hook->do_action(Array) #12 /home/customer/www/stacic1.sg-host.com/public_html/wp-admin/admin.php(419): do_action(‘admin_action_dt…’) #13 {main} thrown in?/home/customer/www/stacic1.sg-host.com/public_html/wp-content/plugins/elementor/core/settings/page/model.php?on line?104


I also cannot create anything new in the theme builder as everytime I try to add a new site part I get redirected to the posts tab.

The page I need help with: [log in to see the link]