A PHP Error was encountered

Severity: Notice

Message: Undefined index: HTTP_REFERER

Filename: controllers/Auth.php

Line Number: 25

Backtrace:

File: /home/nestquest/public_html/application/controllers/Auth.php
Line: 25
Function: _error_handler

File: /home/nestquest/public_html/index.php
Line: 315
Function: require_once

A PHP Error was encountered

Severity: Warning

Message: Cannot modify header information - headers already sent by (output started at /home/nestquest/public_html/system/core/Exceptions.php:272)

Filename: HttpClient/Util.php

Line Number: 49

Backtrace:

File: /home/nestquest/public_html/vendor/hybridauth/hybridauth/src/HttpClient/Util.php
Line: 49
Function: header

File: /home/nestquest/public_html/vendor/hybridauth/hybridauth/src/Adapter/OAuth2.php
Line: 397
Function: redirect

File: /home/nestquest/public_html/vendor/hybridauth/hybridauth/src/Adapter/OAuth2.php
Line: 321
Function: authenticateBegin

File: /home/nestquest/public_html/vendor/hybridauth/hybridauth/src/Hybridauth.php
Line: 103
Function: authenticate

File: /home/nestquest/public_html/application/controllers/Auth.php
Line: 40
Function: authenticate

File: /home/nestquest/public_html/index.php
Line: 315
Function: require_once