A PHP Error was encountered

Severity: Notice

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

Filename: controllers/Welcome.php

Line Number: 48

Backtrace:

File: /home/nutsby/public_html/url_shortener/application/controllers/Welcome.php
Line: 48
Function: _error_handler

File: /home/nutsby/public_html/url_shortener/index.php
Line: 315
Function: require_once

A PHP Error was encountered

Severity: Warning

Message: Cannot modify header information - headers already sent by (output started at /home/nutsby/public_html/url_shortener/system/core/Exceptions.php:272)

Filename: controllers/Welcome.php

Line Number: 66

Backtrace:

File: /home/nutsby/public_html/url_shortener/application/controllers/Welcome.php
Line: 66
Function: header

File: /home/nutsby/public_html/url_shortener/index.php
Line: 315
Function: require_once