Error message

• Warning: Cannot modify header information - headers already sent by (output started at /home/host1531237/tarkhanova.ru/htdocs/www/includes/bootstrap.inc:3837) in drupal_send_headers() (line 1475 of /home/host1531237/tarkhanova.ru/htdocs/www/includes/bootstrap.inc).
• Warning: Cannot modify header information - headers already sent by (output started at /home/host1531237/tarkhanova.ru/htdocs/www/includes/bootstrap.inc:3837) in drupal_send_headers() (line 1475 of /home/host1531237/tarkhanova.ru/htdocs/www/includes/bootstrap.inc).
• Warning: Cannot modify header information - headers already sent by (output started at /home/host1531237/tarkhanova.ru/htdocs/www/includes/bootstrap.inc:3837) in drupal_send_headers() (line 1475 of /home/host1531237/tarkhanova.ru/htdocs/www/includes/bootstrap.inc).
• Warning: Cannot modify header information - headers already sent by (output started at /home/host1531237/tarkhanova.ru/htdocs/www/includes/bootstrap.inc:3837) in drupal_send_headers() (line 1475 of /home/host1531237/tarkhanova.ru/htdocs/www/includes/bootstrap.inc).
• Warning: Cannot modify header information - headers already sent by (output started at /home/host1531237/tarkhanova.ru/htdocs/www/includes/bootstrap.inc:3837) in drupal_send_headers() (line 1475 of /home/host1531237/tarkhanova.ru/htdocs/www/includes/bootstrap.inc).
• Warning: Cannot modify header information - headers already sent by (output started at /home/host1531237/tarkhanova.ru/htdocs/www/includes/bootstrap.inc:3837) in drupal_send_headers() (line 1475 of /home/host1531237/tarkhanova.ru/htdocs/www/includes/bootstrap.inc).