Fatal error: Uncaught Error: Cannot unset string offsets in /var/www/myfitplan/sklep.myfitplan.pl/wp-content/plugins/flexible-checkout-fields/classes/plugin.php:232 Stack trace: #0 /var/www/myfitplan/sklep.myfitplan.pl/wp-includes/class-wp-hook.php(324): Flexible_Checkout_Fields_Plugin->woocommerce_get_country_locale_base(Array) #1 /var/www/myfitplan/sklep.myfitplan.pl/wp-includes/plugin.php(205): WP_Hook->apply_filters(Array, Array) #2 /var/www/myfitplan/sklep.myfitplan.pl/wp-content/plugins/woocommerce/includes/class-wc-countries.php(1660): apply_filters('woocommerce_get...', Array) #3 /var/www/myfitplan/sklep.myfitplan.pl/wp-content/plugins/woocommerce/includes/class-wc-frontend-scripts.php(559): WC_Countries->get_country_locale() #4 /var/www/myfitplan/sklep.myfitplan.pl/wp-content/plugins/woocommerce/includes/class-wc-frontend-scripts.php(473): WC_Frontend_Scripts::get_script_data('wc-address-i18n') #5 /var/www/myfitplan/sklep.myfitplan.pl/wp-content/plugins/woocommerce/includes/class-wc-frontend-scripts.php(642): WC_Frontend_Scripts::localize_script('wc-address-i18n') #6 /var/www/myfitplan/sklep.myfitplan.pl/wp-includes/class-wp-hook.php(324): WC_Frontend_Scripts::localize_printed_scripts('') #7 /var/www/myfitplan/sklep.myfitplan.pl/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters(NULL, Array) #8 /var/www/myfitplan/sklep.myfitplan.pl/wp-includes/plugin.php(517): WP_Hook->do_action(Array) #9 /var/www/myfitplan/sklep.myfitplan.pl/wp-includes/script-loader.php(2217): do_action('wp_print_script...') #10 /var/www/myfitplan/sklep.myfitplan.pl/wp-includes/class-wp-hook.php(324): wp_print_head_scripts('') #11 /var/www/myfitplan/sklep.myfitplan.pl/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters(Array, Array) #12 /var/www/myfitplan/sklep.myfitplan.pl/wp-includes/plugin.php(517): WP_Hook->do_action(Array) #13 /var/www/myfitplan/sklep.myfitplan.pl/wp-includes/general-template.php(3050): do_action('wp_head') #14 /var/www/myfitplan/sklep.myfitplan.pl/wp-content/themes/shoptimizer/header.php(18): wp_head() #15 /var/www/myfitplan/sklep.myfitplan.pl/wp-includes/template.php(810): require_once('/var/www/myfitp...') #16 /var/www/myfitplan/sklep.myfitplan.pl/wp-includes/template.php(745): load_template('/var/www/myfitp...', true, Array) #17 /var/www/myfitplan/sklep.myfitplan.pl/wp-includes/general-template.php(48): locate_template(Array, true, true, Array) #18 /var/www/myfitplan/sklep.myfitplan.pl/wp-content/themes/shoptimizer/page.php(13): get_header() #19 /var/www/myfitplan/sklep.myfitplan.pl/wp-includes/template-loader.php(106): include('/var/www/myfitp...') #20 /var/www/myfitplan/sklep.myfitplan.pl/wp-blog-header.php(19): require_once('/var/www/myfitp...') #21 /var/www/myfitplan/sklep.myfitplan.pl/index.php(17): require('/var/www/myfitp...') #22 {main} thrown in /var/www/myfitplan/sklep.myfitplan.pl/wp-content/plugins/flexible-checkout-fields/classes/plugin.php on line 232