A PHP Error was encountered

Severity: Notice

Message: Undefined index: username

Filename: models/Soal_model.php

Line Number: 28

Backtrace:

File: /home/simulta3/public_html/application/models/Soal_model.php
Line: 28
Function: _error_handler

File: /home/simulta3/public_html/application/controllers/Demo.php
Line: 59
Function: get_array

File: /home/simulta3/public_html/index.php
Line: 315
Function: require_once