Error message

• User warning: The following module is missing from the file system: flexslider_views_slideshow. For information about how to fix this, see the documentation page. in _drupal_trigger_error_with_delayed_logging() (line 1143 of /home/rd/html/entredu-training.ea.gr/includes/bootstrap.inc).
• Deprecated function: Methods with the same name as their class will not be constructors in a future version of PHP; nodequeue_queue has a deprecated constructor in include_once() (line 1374 of /home/rd/html/entredu-training.ea.gr/includes/bootstrap.inc).