Fatal error: Uncaught Error: Class 'WP_Widget' not found in /opt/app-root/src/wp-content/plugins/jetpack/modules/widgets/milestone/class-milestone-widget.php:13 Stack trace: #0 /opt/app-root/src/wp-content/plugins/jetpack/modules/widgets/milestone/milestone.php(11): require_once() #1 {main} thrown in /opt/app-root/src/wp-content/plugins/jetpack/modules/widgets/milestone/class-milestone-widget.php on line 13