A PHP Error was encountered

Severity: Notice

Message: Trying to access array offset on value of type null

Filename: controllers/Teacher.php

Line Number: 10

Backtrace:

File: /home/kvschool/public_html/school/application/modules/teacher/controllers/Teacher.php
Line: 10
Function: _error_handler

File: /home/kvschool/public_html/school/index.php
Line: 382
Function: require_once

A PHP Error was encountered

Severity: Warning

Message: Cannot modify header information - headers already sent by (output started at /home/kvschool/public_html/school/system/core/Exceptions.php:271)

Filename: helpers/url_helper.php

Line Number: 564

Backtrace:

File: /home/kvschool/public_html/school/application/modules/teacher/controllers/Teacher.php
Line: 11
Function: redirect

File: /home/kvschool/public_html/school/index.php
Line: 382
Function: require_once