Fatal error: Uncaught Error: Call to undefined function add_action() in /home/ursatac/public_html/wp-content/plugins/wp-mail-smtp-pro/src/Pro/activation.php:9 Stack trace: #0 {main} thrown in /home/ursatac/public_html/wp-content/plugins/wp-mail-smtp-pro/src/Pro/activation.php on line 9