A PHP Error was encountered

Severity: Notice

Message: Undefined index: HTTP_REFERER

Filename: controllers/Settings.php

Line Number: 599

Backtrace:

File: /home/thamesin/public_html/billing/application/controllers/Settings.php
Line: 599
Function: _error_handler

File: /home/thamesin/public_html/billing/index.php
Line: 305
Function: require_once

A PHP Error was encountered

Severity: Warning

Message: Cannot modify header information - headers already sent by (output started at /home/thamesin/public_html/billing/system/core/Exceptions.php:271)

Filename: helpers/url_helper.php

Line Number: 564

Backtrace:

File: /home/thamesin/public_html/billing/application/controllers/Settings.php
Line: 599
Function: redirect

File: /home/thamesin/public_html/billing/index.php
Line: 305
Function: require_once