Error message

• Warning: Cannot modify header information - headers already sent by (output started at /archive/www/hpcschool-2012/drupal/drupal-7.82/includes/common.inc:2820) in drupal_send_headers() (line 1501 of /archive/www/hpcschool-2012/drupal/drupal-7.82/includes/bootstrap.inc).
• Error: Call to undefined function sql_regcase() in FastGallery->exploreDir() (line 169 of /archive/www/hpcschool-2012/www/sites/default/modules/fast_gallery/fast_gallery.class.php).