Error message

• Warning: Cannot modify header information - headers already sent by (output started at /htdocs/public/www/includes/bootstrap.inc:3495) in _drupal_bootstrap_page_cache() (line 2417 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:3495) in drupal_send_headers() (line 1228 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:3495) in drupal_send_headers() (line 1228 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:3495) in drupal_send_headers() (line 1228 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:3495) in drupal_send_headers() (line 1228 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:3495) in drupal_send_headers() (line 1228 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:3495) in drupal_send_headers() (line 1228 of /htdocs/public/www/includes/bootstrap.inc).