A PHP Error was encountered

Severity: Notice

Message: Undefined variable: url_product

Filename: frontend/product-sale.php

Line Number: 34

Backtrace:

File: /home/vitinhh3/public_html/application/views/frontend/product-sale.php
Line: 34
Function: _error_handler

File: /home/vitinhh3/public_html/application/views/layout.php
Line: 73
Function: view

File: /home/vitinhh3/public_html/application/controllers/Welcome.php
Line: 76
Function: view

File: /home/vitinhh3/public_html/index.php
Line: 315
Function: require_once