A PHP Error was encountered

Severity: Warning

Message: Missing argument 1 for Preview::question_view()

Filename: controllers/Preview.php

Line Number: 53

Backtrace:

File: /var/www/html/application/controllers/Preview.php
Line: 53
Function: _error_handler

File: /var/www/html/index.php
Line: 392
Function: require_once