Fatal error: Uncaught Error: Undefined class constant 'WEBPAGE_HASH' in /home/butane/domains/butanemarket.ir/public_html/wp-content/plugins/wpseo-woocommerce/classes/woocommerce-schema.php:148 Stack trace: #0 /home/butane/domains/butanemarket.ir/public_html/wp-includes/class-wp-hook.php(310): WPSEO_WooCommerce_Schema->change_product(NULL, Object(WC_Product_Simple)) #1 /home/butane/domains/butanemarket.ir/public_html/wp-includes/plugin.php(205): WP_Hook->apply_filters(NULL, Array) #2 /home/butane/domains/butanemarket.ir/public_html/wp-content/plugins/woocommerce/includes/class-wc-structured-data.php(364): apply_filters('woocommerce_str...', Array, Object(WC_Product_Simple)) #3 /home/butane/domains/butanemarket.ir/public_html/wp-includes/class-wp-hook.php(310): WC_Structured_Data->generate_product_data(Object(WC_Product_Simple)) #4 /home/butane/domains/butanemarket.ir/public_html/wp-includes/class-wp-hook.php(334): WP_Hook->apply_filters(NULL, Array) #5 /home/butane/domains/butanemarket.ir/public_html/wp-includes/plugin.php in /home/butane/domains/butanemarket.ir/public_html/wp-content/plugins/wpseo-woocommerce/classes/woocommerce-schema.php on line 148