Error message

• Warning: Cannot modify header information - headers already sent by (output started at /home/zahorszk/public_html/diamond-market.eu/includes/bootstrap.inc:3852) in drupal_send_headers() (line 1490 of /home/zahorszk/public_html/diamond-market.eu/includes/bootstrap.inc).
• Warning: Cannot modify header information - headers already sent by (output started at /home/zahorszk/public_html/diamond-market.eu/includes/bootstrap.inc:3852) in drupal_send_headers() (line 1490 of /home/zahorszk/public_html/diamond-market.eu/includes/bootstrap.inc).
• Warning: Cannot modify header information - headers already sent by (output started at /home/zahorszk/public_html/diamond-market.eu/includes/bootstrap.inc:3852) in drupal_send_headers() (line 1490 of /home/zahorszk/public_html/diamond-market.eu/includes/bootstrap.inc).
• Warning: Cannot modify header information - headers already sent by (output started at /home/zahorszk/public_html/diamond-market.eu/includes/bootstrap.inc:3852) in drupal_send_headers() (line 1490 of /home/zahorszk/public_html/diamond-market.eu/includes/bootstrap.inc).
• Warning: Cannot modify header information - headers already sent by (output started at /home/zahorszk/public_html/diamond-market.eu/includes/bootstrap.inc:3852) in drupal_send_headers() (line 1490 of /home/zahorszk/public_html/diamond-market.eu/includes/bootstrap.inc).
• Warning: Cannot modify header information - headers already sent by (output started at /home/zahorszk/public_html/diamond-market.eu/includes/bootstrap.inc:3852) in drupal_send_headers() (line 1490 of /home/zahorszk/public_html/diamond-market.eu/includes/bootstrap.inc).