Fatal error: Uncaught Error: Call to undefined function is_product() in D:\home\site\wwwroot\wp-content\plugins\download-now-for-woocommerce\woo-files\somdn-woo-functions.php:162 Stack trace: #0 D:\home\site\wwwroot\wp-includes\class-wp-hook.php(288): somdn_is_single_product_woo(false) #1 D:\home\site\wwwroot\wp-includes\plugin.php(206): WP_Hook->apply_filters(false, Array) #2 D:\home\site\wwwroot\wp-content\plugins\download-now-for-woocommerce\includes\somdn-functions.php(137): apply_filters('somdn_is_single...', false) #3 D:\home\site\wwwroot\wp-content\plugins\download-now-for-woocommerce\woo-files\somdn-woo-compatibility.php(457): somdn_is_single_product() #4 D:\home\site\wwwroot\wp-includes\class-wp-hook.php(288): somdn_purchasable_compat_head('') #5 D:\home\site\wwwroot\wp-includes\class-wp-hook.php(312): WP_Hook->apply_filters(NULL, Array) #6 D:\home\site\wwwroot\wp-includes\plugin.php(478): WP_Hook->do_action(Array) #7 D:\home\site\wwwroot\wp-includes\general-template.php(2879): do_action('wp_head') #8 D:\home\sit in D:\home\site\wwwroot\wp-content\plugins\download-now-for-woocommerce\woo-files\somdn-woo-functions.php on line 162