Fatal error: Uncaught Error: Call to undefined method WooCommerce::add_error() in /home1/ancawebs/titin.mx/wp-content/plugins/quantities-and-units-for-woocommerce/includes/class-wcqu-validations.php:119 Stack trace: #0 /home1/ancawebs/titin.mx/wp-content/plugins/quantities-and-units-for-woocommerce/includes/class-wcqu-validations.php(31): WC_Quantities_and_Units_Quantity_Validations->validate_single_product(true, 3676, 1, false, NULL, NULL) #1 /home1/ancawebs/titin.mx/wp-includes/class-wp-hook.php(341): WC_Quantities_and_Units_Quantity_Validations->add_to_cart_validation(true, 3676, 1) #2 /home1/ancawebs/titin.mx/wp-includes/plugin.php(205): WP_Hook->apply_filters(true, Array) #3 /home1/ancawebs/titin.mx/wp-content/plugins/woocommerce/includes/class-wc-form-handler.php(870): apply_filters('woocommerce_add...', true, 3676, 1) #4 /home1/ancawebs/titin.mx/wp-content/plugins/woocommerce/includes/class-wc-form-handler.php(844): WC_Form_Handler::add_to_cart_handler_simple(3676) #5 /home1/ancawebs/titin.mx/wp-includes/class-wp-hook.php(341): WC_Form_Handler::add_to_cart_action('') #6 /home1/ancawebs/titin.mx/wp-includes/class-wp-hook.php(365): WP_Hook->apply_filters(NULL, Array) #7 /home1/ancawebs/titin.mx/wp-includes/plugin.php(522): WP_Hook->do_action(Array) #8 /home1/ancawebs/titin.mx/wp-settings.php(764): do_action('wp_loaded') #9 /home1/ancawebs/titin.mx/wp-config.php(96): require_once('/home1/ancawebs...') #10 /home1/ancawebs/titin.mx/wp-load.php(50): require_once('/home1/ancawebs...') #11 /home1/ancawebs/titin.mx/wp-blog-header.php(13): require_once('/home1/ancawebs...') #12 /home1/ancawebs/titin.mx/index.php(17): require('/home1/ancawebs...') #13 {main} thrown in /home1/ancawebs/titin.mx/wp-content/plugins/quantities-and-units-for-woocommerce/includes/class-wcqu-validations.php on line 119