Error message

• Warning: Cannot modify header information - headers already sent by (output started at /home/content/49/6845749/html/index.php:4) in drupal_send_headers() (line 1505 of /home/content/49/6845749/html/includes/bootstrap.inc).
• Warning: Cannot modify header information - headers already sent by (output started at /home/content/49/6845749/html/index.php:4) in drupal_send_headers() (line 1505 of /home/content/49/6845749/html/includes/bootstrap.inc).
• Warning: Cannot modify header information - headers already sent by (output started at /home/content/49/6845749/html/index.php:4) in drupal_send_headers() (line 1505 of /home/content/49/6845749/html/includes/bootstrap.inc).
• Warning: Cannot modify header information - headers already sent by (output started at /home/content/49/6845749/html/index.php:4) in drupal_send_headers() (line 1505 of /home/content/49/6845749/html/includes/bootstrap.inc).
• Warning: Cannot modify header information - headers already sent by (output started at /home/content/49/6845749/html/index.php:4) in drupal_send_headers() (line 1505 of /home/content/49/6845749/html/includes/bootstrap.inc).
• Warning: Cannot modify header information - headers already sent by (output started at /home/content/49/6845749/html/index.php:4) in drupal_send_headers() (line 1505 of /home/content/49/6845749/html/includes/bootstrap.inc).