Not working in codeigniter 3

[sebastianvirlan]

A PHP Error was encountered

Severity: Notice

Message: Undefined property: CI_Decorator::$load

Filename: libraries/Form_validation.php

Line Number: 147

Backtrace:

File: /home/ingersid/public_html/clienti/sebastianvirlan.com/ProiecteWeb/LifePro/index.php
Line: 292
Function: require_once

Fatal error: Call to a member function helper() on null in /home/ingersid/public_html/clienti/sebastianvirlan.com/ProiecteWeb/LifePro/system/libraries/Form_validation.php on line 147
A PHP Error was encountered

Severity: Error

Message: Call to a member function helper() on null

Filename: libraries/Form_validation.php

Line Number: 147

Backtrace: