Fatal error: Uncaught Error: Call to undefined function add_action() in /data02/c0418613/public_html/test/wp-content/plugins/post-smtp/Postman/Extensions/MainWP-Child/includes/rest-api/v1/class-psmwp-rest-api.php:15 Stack trace: #0 /data02/c0418613/public_html/test/wp-content/plugins/post-smtp/Postman/Extensions/MainWP-Child/includes/rest-api/v1/class-psmwp-rest-api.php(130): PSMWP_Rest_API->__construct() #1 {main} thrown in /data02/c0418613/public_html/test/wp-content/plugins/post-smtp/Postman/Extensions/MainWP-Child/includes/rest-api/v1/class-psmwp-rest-api.php on line 15