A PHP Error was encountered

Severity: Notice

Message: Undefined offset: -1

Filename: frontend/C_f_frontend.php

Line Number: 54

Backtrace:

File: /home/tkwebctho/domains/thietkewebcantho.com/public_html/epack/application/controllers/frontend/C_f_frontend.php
Line: 54
Function: _error_handler

File: /home/tkwebctho/domains/thietkewebcantho.com/public_html/epack/index.php
Line: 315
Function: require_once