Error message

• Warning: Cannot modify header information - headers already sent by (output started at /home/subereco/public_html/etech/index.php:6) in drupal_send_headers() (line 1228 of /home/subereco/public_html/etech/includes/bootstrap.inc).
• Warning: Cannot modify header information - headers already sent by (output started at /home/subereco/public_html/etech/index.php:6) in drupal_send_headers() (line 1228 of /home/subereco/public_html/etech/includes/bootstrap.inc).
• Warning: Cannot modify header information - headers already sent by (output started at /home/subereco/public_html/etech/index.php:6) in drupal_send_headers() (line 1228 of /home/subereco/public_html/etech/includes/bootstrap.inc).
• Warning: Cannot modify header information - headers already sent by (output started at /home/subereco/public_html/etech/index.php:6) in drupal_send_headers() (line 1228 of /home/subereco/public_html/etech/includes/bootstrap.inc).
• Warning: Cannot modify header information - headers already sent by (output started at /home/subereco/public_html/etech/index.php:6) in drupal_send_headers() (line 1228 of /home/subereco/public_html/etech/includes/bootstrap.inc).
• Warning: Cannot modify header information - headers already sent by (output started at /home/subereco/public_html/etech/index.php:6) in drupal_send_headers() (line 1228 of /home/subereco/public_html/etech/includes/bootstrap.inc).