Criar a pasta
/var/www/html/app-mvc/src/view /var/www/html/app-mvc/src/view/error/
Dentro dela o arquivo
index.php
Contendo:
<br><br>
<div class="container text-danger">
<h3 align="center">This page ( controller / method) does not exist.</h3>
</div>
<br><br><br><br>