Fatal error: Uncaught Error: Call to undefined function is_woocommerce() in /home/arayeshy/domains/arayeshyab.com/public_html/wp-content/themes/IranAvada-Child/includes/wc-orderby-instock.php:16 Stack trace: #0 /home/arayeshy/domains/arayeshyab.com/public_html/wp-includes/class-wp-hook.php(326): iWC_Orderby_inStock_Status->order_by_stock_status(Array) #1 /home/arayeshy/domains/arayeshyab.com/public_html/wp-includes/plugin.php(256): WP_Hook->apply_filters(Array, Array) #2 /home/arayeshy/domains/arayeshyab.com/public_html/wp-includes/class-wp-query.php(2950): apply_filters_ref_array('posts_clauses', Array) #3 /home/arayeshy/domains/arayeshyab.com/public_html/wp-includes/class-wp-query.php(3824): WP_Query->get_posts() #4 /home/arayeshy/domains/arayeshyab.com/public_html/wp-includes/class-wp.php(696): WP_Query->query(Array) #5 /home/arayeshy/domains/arayeshyab.com/public_html/wp-includes/class-wp.php(816): WP->query_posts() #6 /home/arayeshy/domains/arayeshyab.com/public_html/wp-includes/functions.php(1336): WP->main('') #7 / in /home/arayeshy/domains/arayeshyab.com/public_html/wp-content/themes/IranAvada-Child/includes/wc-orderby-instock.php on line 16