A PHP Error was encountered

Severity: Notice

Message: Undefined variable: single

Filename: layouts/sidebar.php

Line Number: 8

Backtrace:

File: /www/step4wd/public_html/application/views/layouts/sidebar.php
Line: 8
Function: _error_handler

File: /www/step4wd/public_html/application/controllers/Authors.php
Line: 52
Function: view

File: /www/step4wd/public_html/application/controllers/Authors.php
Line: 11
Function: get_profile

File: /www/step4wd/public_html/index.php
Line: 321
Function: require_once