An uncaught Exception was encountered

Type: TypeError

Message: call_user_func_array(): Argument #1 ($callback) must be a valid callback, class App does not have a method "error404"

Filename: /var/www4/p3768/joomladesing.eu/web/release_20240303182032/system/core/CodeIgniter.php

Line Number: 533

Backtrace:

File: /var/www4/p3768/joomladesing.eu/web/release_20240303182032/index.php
Line: 315
Function: require_once