Komunikat o błędzie

• Warning: Cannot modify header information - headers already sent by (output started at /includes/common.inc:2861) w drupal_send_headers() (linia 1554 z /includes/bootstrap.inc).
• Error: Call to a member function storeImages() on null w FastGallery->rescanGallery() (linia 49 z /modules/fast_gallery/fast_gallery.class.php).