Fatal error: Uncaught Error: Call to undefined function is_product() in /home/sites/prometheusjournal.co.uk/public_html/wp-content/plugins/download-now-for-woocommerce/woo-files/somdn-woo-functions.php:96 Stack trace: #0 /home/sites/prometheusjournal.co.uk/public_html/wp-includes/class-wp-hook.php(324): somdn_is_single_product_woo(false) #1 /home/sites/prometheusjournal.co.uk/public_html/wp-includes/plugin.php(205): WP_Hook->apply_filters(false, Array) #2 /home/sites/prometheusjournal.co.uk/public_html/wp-content/plugins/download-now-for-woocommerce/Includes/Legacy/somdn-functions.php(144): apply_filters('somdn_is_single...', false) #3 /home/sites/prometheusjournal.co.uk/public_html/wp-content/plugins/download-now-for-woocommerce/woo-files/somdn-woo-compatibility.php(466): somdn_is_single_product() #4 /home/sites/prometheusjournal.co.uk/public_html/wp-includes/class-wp-hook.php(324): somdn_purchasable_compat_head('') #5 /home/sites/prometheusjournal.co.uk/public_html/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters(NULL, Array) #6 /home/sites/prometheusjournal.co.uk/public_html/wp-includes/plugin.php(517): WP_Hook->do_action(Array) #7 /home/sites/prometheusjournal.co.uk/public_html/wp-includes/general-template.php(3064): do_action('wp_head') #8 /home/sites/prometheusjournal.co.uk/public_html/wp-includes/template-canvas.php(17): wp_head() #9 /home/sites/prometheusjournal.co.uk/public_html/wp-includes/template-loader.php(106): include('/home/sites/pro...') #10 /home/sites/prometheusjournal.co.uk/public_html/wp-blog-header.php(19): require_once('/home/sites/pro...') #11 /home/sites/prometheusjournal.co.uk/public_html/index.php(17): require('/home/sites/pro...') #12 {main} thrown in /home/sites/prometheusjournal.co.uk/public_html/wp-content/plugins/download-now-for-woocommerce/woo-files/somdn-woo-functions.php on line 96