"error 2" - error2 - blank page error

[Andreiii]

After deleting "discard" news, the urls to them go to "error 2". How to redirect it to 404?

[Andreiii]

How to modify this:

users_extra_fields_main.php

$user=new User();
$user->username = $link->username();
if(!$user->read()) {
	echo "error 2";
	die;
	}

?