Hi!
I’m getting the following errors on the page:
Notice: Undefined index: active in /var/www/quippe_2014/wp-content/plugins/wp-maintenance/wp-maintenance.php on line 405 Notice: Undefined index: disable in /var/www/quippe_2014/wp-content/plugins/wp-maintenance/wp-maintenance.php on line 424
It says, that it’s coming from the wp-maintenance plugin. You most likely have the debug mode enabled and the upper mentioned plugin is throwing the notices.