A PHP Error was encountered

Severity: 8192

Message: strtoupper(): Passing null to parameter #1 ($string) of type string is deprecated

Filename: views/forgot-password.php

Line Number: 21

Backtrace:

File: /var/www/znatic_com_usr/data/www/znatic.com/anant/application/views/forgot-password.php
Line: 21
Function: strtoupper

File: /var/www/znatic_com_usr/data/www/znatic.com/anant/application/controllers/Login.php
Line: 64
Function: view

File: /var/www/znatic_com_usr/data/www/znatic.com/anant/index.php
Line: 306
Function: require_once