Error message

Warning: ini_set(): Headers already sent. You cannot change the session module's ini settings at this time in drupal_environment_initialize() (line 695 of /home/altanet/public_html/includes/bootstrap.inc).
Warning: ini_set(): Headers already sent. You cannot change the session module's ini settings at this time in drupal_environment_initialize() (line 696 of /home/altanet/public_html/includes/bootstrap.inc).
Warning: ini_set(): Headers already sent. You cannot change the session module's ini settings at this time in drupal_environment_initialize() (line 697 of /home/altanet/public_html/includes/bootstrap.inc).
Warning: ini_set(): Headers already sent. You cannot change the session module's ini settings at this time in drupal_environment_initialize() (line 700 of /home/altanet/public_html/includes/bootstrap.inc).
Warning: ini_set(): Headers already sent. You cannot change the session module's ini settings at this time in drupal_environment_initialize() (line 702 of /home/altanet/public_html/includes/bootstrap.inc).
Warning: ini_set(): Headers already sent. You cannot change the session module's ini settings at this time in include_once() (line 38 of /home/altanet/public_html/sites/mdpa/settings.php).
Warning: ini_set(): Headers already sent. You cannot change the session module's ini settings at this time in include_once() (line 39 of /home/altanet/public_html/sites/mdpa/settings.php).
Warning: ini_set(): Headers already sent. You cannot change the session module's ini settings at this time in include_once() (line 40 of /home/altanet/public_html/sites/mdpa/settings.php).
Warning: ini_set(): Headers already sent. You cannot change the session module's ini settings at this time in include_once() (line 41 of /home/altanet/public_html/sites/mdpa/settings.php).
Warning: ini_set(): Headers already sent. You cannot change the session module's ini settings at this time in drupal_settings_initialize() (line 819 of /home/altanet/public_html/includes/bootstrap.inc).
Warning: ini_set(): Headers already sent. You cannot change the session module's ini settings at this time in drupal_settings_initialize() (line 828 of /home/altanet/public_html/includes/bootstrap.inc).
Warning: session_name(): Cannot change session name when headers already sent in drupal_settings_initialize() (line 831 of /home/altanet/public_html/includes/bootstrap.inc).
Warning: session_set_save_handler(): Cannot change save handler when headers already sent in drupal_session_initialize() (line 242 of /home/altanet/public_html/includes/session.inc).
Warning: session_id(): Cannot change session id when headers already sent in drupal_session_initialize() (line 266 of /home/altanet/public_html/includes/session.inc).
Warning: Cannot modify header information - headers already sent by (output started at /home/altanet/public_html/index.php:1) in drupal_send_headers() (line 1503 of /home/altanet/public_html/includes/bootstrap.inc).
Warning: Cannot modify header information - headers already sent by (output started at /home/altanet/public_html/index.php:1) in drupal_send_headers() (line 1503 of /home/altanet/public_html/includes/bootstrap.inc).
Warning: Cannot modify header information - headers already sent by (output started at /home/altanet/public_html/index.php:1) in drupal_send_headers() (line 1503 of /home/altanet/public_html/includes/bootstrap.inc).
Warning: Cannot modify header information - headers already sent by (output started at /home/altanet/public_html/index.php:1) in drupal_send_headers() (line 1503 of /home/altanet/public_html/includes/bootstrap.inc).
Warning: Cannot modify header information - headers already sent by (output started at /home/altanet/public_html/index.php:1) in drupal_send_headers() (line 1503 of /home/altanet/public_html/includes/bootstrap.inc).
Warning: Cannot modify header information - headers already sent by (output started at /home/altanet/public_html/index.php:1) in drupal_send_headers() (line 1503 of /home/altanet/public_html/includes/bootstrap.inc).