A PHP Error was encountered

Severity: Warning

Message: Undefined variable $url

Filename: controllers/Booking.php

Line Number: 221

Backtrace:

File: /home/joyja/public_html/hms/application/modules/booking/controllers/Booking.php
Line: 221
Function: _error_handler

File: /home/joyja/public_html/hms/index.php
Line: 316
Function: require_once