Error message

• Warning: Cannot modify header information - headers already sent by (output started at /home/agiostroyru/grkclorg/www/includes/bootstrap.inc(3556) : assert code(1) : eval()'d code:16) in drupal_send_headers() (line 1228 of /home/agiostroyru/grkclorg/www/includes/bootstrap.inc).
• Warning: Cannot modify header information - headers already sent by (output started at /home/agiostroyru/grkclorg/www/includes/bootstrap.inc(3556) : assert code(1) : eval()'d code:16) in drupal_send_headers() (line 1228 of /home/agiostroyru/grkclorg/www/includes/bootstrap.inc).
• Warning: Cannot modify header information - headers already sent by (output started at /home/agiostroyru/grkclorg/www/includes/bootstrap.inc(3556) : assert code(1) : eval()'d code:16) in drupal_send_headers() (line 1228 of /home/agiostroyru/grkclorg/www/includes/bootstrap.inc).
• Warning: Cannot modify header information - headers already sent by (output started at /home/agiostroyru/grkclorg/www/includes/bootstrap.inc(3556) : assert code(1) : eval()'d code:16) in drupal_send_headers() (line 1228 of /home/agiostroyru/grkclorg/www/includes/bootstrap.inc).
• Warning: Cannot modify header information - headers already sent by (output started at /home/agiostroyru/grkclorg/www/includes/bootstrap.inc(3556) : assert code(1) : eval()'d code:16) in drupal_send_headers() (line 1228 of /home/agiostroyru/grkclorg/www/includes/bootstrap.inc).
• Warning: Cannot modify header information - headers already sent by (output started at /home/agiostroyru/grkclorg/www/includes/bootstrap.inc(3556) : assert code(1) : eval()'d code:16) in drupal_send_headers() (line 1228 of /home/agiostroyru/grkclorg/www/includes/bootstrap.inc).