A PHP Error was encountered

Severity: Notice

Message: Trying to get property of non-object

Filename: inc/header.php

Line Number: 57

Backtrace:

File: /home/musium/html/application/views/inc/header.php
Line: 57
Function: _error_handler

File: /home/musium/html/application/controllers/Index.php
Line: 61
Function: view

File: /home/musium/html/index.php
Line: 292
Function: require_once