Fatal error: Uncaught Error: Call to undefined function is_admin() in /home/pubconcom/public_html/wp-content/plugins/woocommerce-advanced-notifications/includes/class-wc-advanced-notifications.php:21 Stack trace: #0 /home/pubconcom/public_html/wp-content/plugins/woocommerce-advanced-notifications/includes/class-wc-advanced-notifications.php(672): WC_Advanced_Notifications->__construct() #1 {main} thrown in /home/pubconcom/public_html/wp-content/plugins/woocommerce-advanced-notifications/includes/class-wc-advanced-notifications.php on line 21