Fatal error: Uncaught TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, function "mihanwp_sort_by_stock_and_quantity" not found or invalid function name in /home/hayatper/public_html/wp-includes/class-wp-hook.php:326 Stack trace: #0 /home/hayatper/public_html/wp-includes/plugin.php(205): WP_Hook->apply_filters(Array, Array) #1 /home/hayatper/public_html/wp-content/plugins/woocommerce/includes/class-wc-query.php(649): apply_filters('woocommerce_get...', Array, 'date', '') #2 /home/hayatper/public_html/wp-content/plugins/woocommerce/includes/class-wc-query.php(520): WC_Query->get_catalog_ordering_args() #3 /home/hayatper/public_html/wp-content/plugins/woocommerce/includes/class-wc-query.php(422): WC_Query->product_query(Object(WP_Query)) #4 /home/hayatper/public_html/wp-includes/class-wp-hook.php(324): WC_Query->pre_get_posts(Object(WP_Query)) #5 /home/hayatper/public_html/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters('', Array) #6 /home/hayatper/public_html/wp-includes/plugin.php(565): WP_Hook->do_action(Array) #7 /home/hayatper/public_html/wp-includes/class-wp-query.php(1881): do_action_ref_array('pre_get_posts', Array) #8 /home/hayatper/public_html/wp-includes/class-wp-query.php(3824): WP_Query->get_posts() #9 /home/hayatper/public_html/wp-includes/class-wp.php(696): WP_Query->query(Array) #10 /home/hayatper/public_html/wp-includes/class-wp.php(816): WP->query_posts() #11 /home/hayatper/public_html/wp-includes/functions.php(1336): WP->main('') #12 /home/hayatper/public_html/wp-blog-header.php(16): wp() #13 /home/hayatper/public_html/index.php(17): require('/home/hayatper/...') #14 {main} thrown in /home/hayatper/public_html/wp-includes/class-wp-hook.php on line 326