A PHP Error was encountered

Severity: Notice

Message: Undefined index: user_id

Filename: controllers/Complain.php

Line Number: 21

Backtrace:

File: /var/www/html/callnvanfront/application/controllers/Complain.php
Line: 21
Function: _error_handler

File: /var/www/html/callnvanfront/application/controllers/Complain.php
Line: 17
Function: Lists

File: /var/www/html/callnvanfront/index.php
Line: 316
Function: require_once