Error message

• Warning: Cannot modify header information - headers already sent by (output started at /var/www/vhosts/satirthailand.org/httpdocs/index.php:1) in drupal_send_headers() (line 1236 of /var/www/vhosts/satirthailand.org/httpdocs/includes/bootstrap.inc).
• Warning: Cannot modify header information - headers already sent by (output started at /var/www/vhosts/satirthailand.org/httpdocs/index.php:1) in drupal_send_headers() (line 1236 of /var/www/vhosts/satirthailand.org/httpdocs/includes/bootstrap.inc).
• Warning: Cannot modify header information - headers already sent by (output started at /var/www/vhosts/satirthailand.org/httpdocs/index.php:1) in drupal_send_headers() (line 1236 of /var/www/vhosts/satirthailand.org/httpdocs/includes/bootstrap.inc).
• Warning: Cannot modify header information - headers already sent by (output started at /var/www/vhosts/satirthailand.org/httpdocs/index.php:1) in drupal_send_headers() (line 1236 of /var/www/vhosts/satirthailand.org/httpdocs/includes/bootstrap.inc).
• Warning: Cannot modify header information - headers already sent by (output started at /var/www/vhosts/satirthailand.org/httpdocs/index.php:1) in drupal_send_headers() (line 1236 of /var/www/vhosts/satirthailand.org/httpdocs/includes/bootstrap.inc).