Fatal error e problem with currency symbol

In the currency settings, they all have the euro symbol, even pounds sterling

The plugin throws errors like this:

Fatal error: Uncaught ArgumentCountError: Too few arguments to function WOOCS::woocommerce_fix_shipping_calc(), 2 passed in /home/customer/www/monroiroma.com/public_html/wp-includes/class-wp-hook.php on line 307 and exactly 3 expected in /home/customer/www/monroiroma.com/public_html/wp-content/plugins/woocommerce-currency-switcher/classes/woocs.php:4921 Stack trace: #0 /home/customer/www/monroiroma.com/public_html/wp-includes/class-wp-hook.php(307): WOOCS->woocommerce_fix_shipping_calc(Array, ’18’) #1 /home/customer/www/monroiroma.com/public_html/wp-includes/plugin.php(189): WP_Hook->apply_filters(Array, Array) #2 /home/customer/www/monroiroma.com/public_html/wp-content/plugins/woocommerce-multi-currency/frontend/shipping.php(275): apply_filters(‘woocommerce_eva…’, Array, ’18’) #3 /home/customer/www/monroiroma.com/public_html/wp-content/plugins/woocommerce-multi-currency/frontend/shipping.php(199): WOOMULTI_CURRENCY_Frontend_Shipping->evaluate_cost(’18’, Array) #4 /home/customer/www/monroiroma.com/public_html/wp-include in /home/customer/www/monroiroma.com/public_html/wp-content/plugins/woocommerce-currency-switcher/classes/woocs.php on line 4921