PHP:
Fatal error: Uncaught Error: Class "WP_Widget" not found in /www/habi.gna.ch/doc/wp-includes/widgets/class-wp-widget-recent-posts.php:17
Stack trace:
#0 {main}
thrown in /www/habi.gna.ch/doc/wp-includes/widgets/class-wp-widget-recent-posts.php on line 17