Conflict between Woodmart theme and Woocommerce plugin

Hi,

I have a serious problem with one site and I can’t solve it.

After updating plugins and Woodmart Theme:
-Contact Form 7
-Elementor Pro
-MC4WP: Mailchimp for WordPress
-WooCommerce
-WooCommerce PDF Invoices, Packing Slips, Delivery Notes and Shipping Labels

I also tried turning off all plugins except Elementor and Elementor Pro and I get the same error so I assume Woodmart Theme and WooCommerce plugin is causing this.

Yesterday I installed the following WooCommerce related plugins (Custom Order Status Manager for WooCommerce, mPDF addon for PDF Invoices, WC Serial Numbers, WC Serial Numbers Pro, WooCommerce PDF Invoices, Packing Slips, Delivery Notes and Shipping Labels) and everything worked quite normal until I just updated the mentioned plugins.

When I start editing the page through Elementor, I get an error like the one below.

Uncaught Error: Cannot unset string offsets in /home/imlicens/public_html/wp-content/themes/woodmart/inc/integrations/woocommerce/modules/checkout-fields/class-frontend.php:111
Stack trace:
#0 /home/imlicens/public_html/wp-includes/class-wp-hook.php(324): XTS\Modules\Checkout_Fields\Frontend->change_locale_fields(Array)
#1 /home/imlicens/public_html/wp-includes/plugin.php(205): WP_Hook->apply_filters(Array, Array)
#2 /home/imlicens/public_html/wp-content/plugins/woocommerce/includes/class-wc-countries.php(1644): apply_filters(‘woocommerce_get…’, Array)
#3 /home/imlicens/public_html/wp-content/plugins/woocommerce/includes/class-wc-frontend-scripts.php(549): WC_Countries->get_country_locale()
#4 /home/imlicens/public_html/wp-content/plugins/woocommerce/includes/class-wc-frontend-scripts.php(465): WC_Frontend_Scripts::get_script_data(‘wc-address-i18n’)
#5 /home/imlicens/public_html/wp-content/plugins/woocommerce/includes/class-wc-frontend-scripts.php(632): WC_Frontend_Scripts::localize_script(‘wc-address-i18n’)
#6 /home/imlicens/public_html/wp-includes/class-wp-hook.php(324): WC_Frontend_Scripts::localize_printed_scripts(”)
#7 /home/imlicens/public_html/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters(NULL, Array)
#8 /home/imlicens/public_html/wp-includes/plugin.php(517): WP_Hook->do_action(Array)
#9 /home/imlicens/public_html/wp-includes/script-loader.php(2214): do_action(‘wp_print_script…’)
#10 /home/imlicens/public_html/wp-includes/class-wp-hook.php(324): wp_print_head_scripts(”)
#11 /home/imlicens/public_html/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters(Array, Array)
#12 /home/imlicens/public_html/wp-includes/plugin.php(517): WP_Hook->do_action(Array)
#13 /home/imlicens/public_html/wp-includes/general-template.php(3052): do_action(‘wp_head’)
#14 /home/imlicens/public_html/wp-content/themes/woodmart/header.php(12): wp_head()
#15 /home/imlicens/public_html/wp-includes/template.php(790): require_once(‘/home/imlicens/…’)
#16 /home/imlicens/public_html/wp-includes/template.php(725): load_template(‘/home/imlicens/…’, true, Array)
#17 /home/imlicens/public_html/wp-includes/general-template.php(48): locate_template(Array, true, true, Array)
#18 /home/imlicens/public_html/wp-content/themes/woodmart/page.php(13): get_header()
#19 /home/imlicens/public_html/wp-includes/template-loader.php(106): include(‘/home/imlicens/…’)
#20 /home/imlicens/public_html/wp-blog-header.php(19): require_once(‘/home/imlicens/…’)
#21 /home/imlicens/public_html/index.php(17): require(‘/home/imlicens/…’)
#22 {main}
thrown