A PHP Error was encountered

Severity: Warning

Message: call_user_func_array() expects parameter 1 to be a valid callback, class 'Error' does not have a method 'error_404'

Filename: core/CodeIgniter.php

Line Number: 532

Backtrace:

File: /home/polt2194/public_html/index.php
Line: 317
Function: require_once

A PHP Error was encountered

Severity: Warning

Message: Cannot modify header information - headers already sent by (output started at /home/polt2194/public_html/system/core/Exceptions.php:271)

Filename: core/Common.php

Line Number: 570

Backtrace:

An uncaught Exception was encountered

Type: Error

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

Filename: /home/polt2194/public_html/application/hooks/compress_html.php

Line Number: 6

Backtrace:

File: /home/polt2194/public_html/index.php
Line: 317
Function: require_once