Fatal error: Uncaught Error: Call to undefined function is_product() in /var/www/html/prod_academics/wp-content/plugins/download-now-for-woocommerce/woo-files/somdn-woo-functions.php:90 Stack trace: #0 /var/www/html/prod_academics/wp-includes/class-wp-hook.php(303): somdn_is_single_product_woo() #1 /var/www/html/prod_academics/wp-includes/plugin.php(189): WP_Hook->apply_filters() #2 /var/www/html/prod_academics/wp-content/plugins/download-now-for-woocommerce/includes/somdn-functions.php(142): apply_filters() #3 /var/www/html/prod_academics/wp-content/plugins/download-now-for-woocommerce/woo-files/somdn-woo-compatibility.php(460): somdn_is_single_product() #4 /var/www/html/prod_academics/wp-includes/class-wp-hook.php(303): somdn_purchasable_compat_head() #5 /var/www/html/prod_academics/wp-includes/class-wp-hook.php(327): WP_Hook->apply_filters() #6 /var/www/html/prod_academics/wp-includes/plugin.php(470): WP_Hook->do_action() #7 /var/www/html/prod_academics/wp-includes/general-template.php(3015): do_action() #8 /var/www/ht in /var/www/html/prod_academics/wp-content/plugins/download-now-for-woocommerce/woo-files/somdn-woo-functions.php on line 90