A PHP Error was encountered

Severity: Notice

Message: Undefined variable: url

Filename: views/header.php

Line Number: 48

Backtrace:

File: /home/tsmd3xbdkr9r/public_html/application/views/header.php
Line: 48
Function: _error_handler

File: /home/tsmd3xbdkr9r/public_html/application/views/about.php
Line: 1
Function: include

File: /home/tsmd3xbdkr9r/public_html/application/controllers/User.php
Line: 37
Function: view

File: /home/tsmd3xbdkr9r/public_html/application/controllers/User.php
Line: 18
Function: about

File: /home/tsmd3xbdkr9r/public_html/index.php
Line: 315
Function: require_once