Mohon bantuanya agan-agan, saya ingin menampilkan keranjang belanja tapi ko muncul pesan error seperti ini :

A PHP Error was encountered

Severity: Warning

Message: Cannot modify header information - headers already sent by (output started at D:\xampp\htdocs\CodeIgniter\application\controllers\form.php:75)

Filename: core/Common.php

Line Number: 413
An Error Was Encountered

In order to use the Session class you are required to set an encryption key in your config file.


padahal di view dan kontrollernya udah saya periksa tidak ada kesalahan untuk penulisanya ,,
Makasih,