Error message

• Warning: ini_set(): Headers already sent. You cannot change the session module's ini settings at this time in include_once() (line 335 of /home/richard/public_html/sites/default/settings.php).
• Warning: ini_set(): Headers already sent. You cannot change the session module's ini settings at this time in include_once() (line 336 of /home/richard/public_html/sites/default/settings.php).
• Warning: ini_set(): Headers already sent. You cannot change the session module's ini settings at this time in include_once() (line 344 of /home/richard/public_html/sites/default/settings.php).
• Warning: ini_set(): Headers already sent. You cannot change the session module's ini settings at this time in include_once() (line 351 of /home/richard/public_html/sites/default/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/richard/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/richard/public_html/includes/bootstrap.inc).
• Warning: session_name(): Cannot change session name when headers already sent in drupal_settings_initialize() (line 831 of /home/richard/public_html/includes/bootstrap.inc).
• Warning: Cannot modify header information - headers already sent by (output started at /home/richard/public_html/sites/default/settings.php:1) in _drupal_bootstrap_page_cache() (line 2705 of /home/richard/public_html/includes/bootstrap.inc).