Error message

• Warning: Cannot modify header information - headers already sent by (output started at /home/content/58/3877858/html/sajtovi/svetigracaka/index.php:4) in _drupal_bootstrap_page_cache() (line 2707 of /home/content/58/3877858/html/sajtovi/svetigracaka/includes/bootstrap.inc).
• Warning: Cannot modify header information - headers already sent by (output started at /home/content/58/3877858/html/sajtovi/svetigracaka/index.php:4) in drupal_send_headers() (line 1503 of /home/content/58/3877858/html/sajtovi/svetigracaka/includes/bootstrap.inc).
• Warning: Cannot modify header information - headers already sent by (output started at /home/content/58/3877858/html/sajtovi/svetigracaka/index.php:4) in drupal_send_headers() (line 1503 of /home/content/58/3877858/html/sajtovi/svetigracaka/includes/bootstrap.inc).
• Warning: Cannot modify header information - headers already sent by (output started at /home/content/58/3877858/html/sajtovi/svetigracaka/index.php:4) in drupal_send_headers() (line 1503 of /home/content/58/3877858/html/sajtovi/svetigracaka/includes/bootstrap.inc).
• Warning: Cannot modify header information - headers already sent by (output started at /home/content/58/3877858/html/sajtovi/svetigracaka/index.php:4) in drupal_send_headers() (line 1503 of /home/content/58/3877858/html/sajtovi/svetigracaka/includes/bootstrap.inc).
• Warning: Cannot modify header information - headers already sent by (output started at /home/content/58/3877858/html/sajtovi/svetigracaka/index.php:4) in drupal_send_headers() (line 1503 of /home/content/58/3877858/html/sajtovi/svetigracaka/includes/bootstrap.inc).
• Warning: Cannot modify header information - headers already sent by (output started at /home/content/58/3877858/html/sajtovi/svetigracaka/index.php:4) in drupal_send_headers() (line 1503 of /home/content/58/3877858/html/sajtovi/svetigracaka/includes/bootstrap.inc).