Error message

• Warning: Cannot modify header information - headers already sent by (output started at /home/naff245/aadhaarfoods.com/includes/common.inc:2861) in drupal_send_headers() (line 1554 of includes/bootstrap.inc).
• Error: Undefined constant "DRUPAL_CRON_DETAILED_LOGGING" in drupal_cron_run() (line 5554 of includes/common.inc).