Fatal error: Uncaught Error: Call to undefined function WP_STATISTICS\add_action() in /home/webdav/xylemDAV/mo.blog/wp-content/plugins/wp-statistics/includes/admin/class-wp-statistics-admin-ajax.php:16 Stack trace: #0 /home/webdav/xylemDAV/mo.blog/wp-content/plugins/wp-statistics/includes/admin/class-wp-statistics-admin-ajax.php(638): WP_STATISTICS\Ajax->__construct() #1 {main} thrown in /home/webdav/xylemDAV/mo.blog/wp-content/plugins/wp-statistics/includes/admin/class-wp-statistics-admin-ajax.php on line 16