Severity: Warning
Message: Cannot modify header information - headers already sent by (output started at /var/www/attsub_ceisa/application/third_party/PHPExcel/Calculation.php:3460)
Filename: helpers/url_helper.php
Line Number: 564
Backtrace:
File: /var/www/attsub_ceisa/application/libraries/Accesscontrol.php
Line: 20
Function: redirect
File: /var/www/attsub_ceisa/application/modules/security/controllers/Welcome.php
Line: 8
Function: check_session
File: /var/www/attsub_ceisa/index.php
Line: 321
Function: require_once