Fatal error: Uncaught Error: Call to undefined function Automattic\Jetpack\Third_Party\add_action() in /usr/www/users/dalc/wp-content/plugins/jetpack/3rd-party/class-domain-mapping.php:53 Stack trace: #0 /usr/www/users/dalc/wp-content/plugins/jetpack/3rd-party/class-domain-mapping.php(43): Automattic\Jetpack\Third_Party\Domain_Mapping->__construct() #1 /usr/www/users/dalc/wp-content/plugins/jetpack/3rd-party/class-domain-mapping.php(160): Automattic\Jetpack\Third_Party\Domain_Mapping::init() #2 {main} thrown in /usr/www/users/dalc/wp-content/plugins/jetpack/3rd-party/class-domain-mapping.php on line 53