A PHP Error was encountered

Severity: Notice

Message: Trying to get property of non-object

Filename: libraries/Web_server.php

Line Number: 20

Backtrace:

File: /var/www/vhosts/acrossiran.com/a2ztravel.ir/application/libraries/Web_server.php
Line: 20
Function: _error_handler

File: /var/www/vhosts/acrossiran.com/a2ztravel.ir/application/controllers/Home.php
Line: 9
Function: library

File: /var/www/vhosts/acrossiran.com/a2ztravel.ir/index.php
Line: 273
Function: require_once