A PHP Error was encountered

Severity: Notice

Message: Undefined index: topics-city-shopping

Filename: controllers/Content.php

Line Number: 664

Backtrace:

File: /srv/users/serverpilot/apps/flashcardo-main/application/controllers/Content.php
Line: 664
Function: _error_handler

File: /srv/users/serverpilot/apps/flashcardo-main/public/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 /srv/users/serverpilot/apps/flashcardo-main/system/core/Exceptions.php:271)

Filename: helpers/url_helper.php

Line Number: 561

Backtrace:

File: /srv/users/serverpilot/apps/flashcardo-main/application/controllers/Content.php
Line: 435
Function: redirect

File: /srv/users/serverpilot/apps/flashcardo-main/application/controllers/Content.php
Line: 668
Function: redirectHome

File: /srv/users/serverpilot/apps/flashcardo-main/public/index.php
Line: 315
Function: require_once