A PHP Error was encountered

Severity: Notice

Message: Undefined variable: sum

Filename: views/cart.php

Line Number: 151

Backtrace:

File: /home/lnru7503maqk/public_html/application/views/cart.php
Line: 151
Function: _error_handler

File: /home/lnru7503maqk/public_html/application/controllers/Welcome.php
Line: 189
Function: view

File: /home/lnru7503maqk/public_html/index.php
Line: 315
Function: require_once