Error message

• Warning: Cannot modify header information - headers already sent by (output started at /htdocs/public/www/includes/bootstrap.inc:3446) in drupal_send_headers() (line 1220 of /htdocs/public/www/includes/bootstrap.inc).
• Warning: Cannot modify header information - headers already sent by (output started at /htdocs/public/www/includes/bootstrap.inc:3446) in drupal_send_headers() (line 1220 of /htdocs/public/www/includes/bootstrap.inc).
• Warning: Cannot modify header information - headers already sent by (output started at /htdocs/public/www/includes/bootstrap.inc:3446) in drupal_send_headers() (line 1220 of /htdocs/public/www/includes/bootstrap.inc).
• Warning: Cannot modify header information - headers already sent by (output started at /htdocs/public/www/includes/bootstrap.inc:3446) in drupal_send_headers() (line 1220 of /htdocs/public/www/includes/bootstrap.inc).
• Warning: Cannot modify header information - headers already sent by (output started at /htdocs/public/www/includes/bootstrap.inc:3446) in drupal_send_headers() (line 1220 of /htdocs/public/www/includes/bootstrap.inc).
• Warning: Cannot modify header information - headers already sent by (output started at /htdocs/public/www/includes/bootstrap.inc:3446) in drupal_send_headers() (line 1220 of /htdocs/public/www/includes/bootstrap.inc).