Fatal error: Uncaught Error: Class 'WP_Widget' not found in /home/.sites/162/site1406375/web/LIVE/wp-includes/widgets/class-wp-widget-calendar.php:17
Stack trace:
#0 {main}
  thrown in /home/.sites/162/site1406375/web/LIVE/wp-includes/widgets/class-wp-widget-calendar.php on line 17