A PHP Error was encountered

Severity: Notice

Message: Undefined index: HTTP_REFERER

Filename: controllers/Composition.php

Line Number: 12

Backtrace:

File: /var/www/html/application/controllers/Composition.php
Line: 12
Function: _error_handler

File: /var/www/html/index.php
Line: 315
Function: require_once

A PHP Error was encountered

Severity: Notice

Message: Undefined offset: 2

Filename: controllers/Composition.php

Line Number: 14

Backtrace:

File: /var/www/html/application/controllers/Composition.php
Line: 14
Function: _error_handler

File: /var/www/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 /var/www/html/system/core/Exceptions.php:271)

Filename: helpers/url_helper.php

Line Number: 564

Backtrace:

File: /var/www/html/application/controllers/Composition.php
Line: 21
Function: redirect

File: /var/www/html/index.php
Line: 315
Function: require_once